build: overhaul build system auto detect stuff using a configure script

The new build instructions are:

 $ ./configure && make && sudo make install

The configure script tries to auto detect support for various libraries
and compiler options. These choices can be overwritten by explicitly
specifing --{en,dis}able-{lua,selinux,acl}. See ./configure --help for
all supported options.

The configure script generates config.mk which should allow portable
(among GNU and BSD make) Makefiles. Manually editing config.mk is
still supported.

6 files changed, 663 insertions, 254 deletions

diff --git a/.gitignore b/.gitignore
index a3fd03a..c495cf0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 /config.h
+/config.mk
 *.swo
 *.swp
 *.o
diff --git a/GNUmakefile b/GNUmakefile
new file mode 100644
index 0000000..f6e57d7
--- /dev/null
+++ b/GNUmakefile
@@ -0,0 +1,165 @@
+include Makefile
+
+SRCDIR = $(realpath $(dir $(firstword $(MAKEFILE_LIST))))
+
+DEPS_ROOT = $(SRCDIR)/dependency/install
+DEPS_PREFIX = $(DEPS_ROOT)/usr
+DEPS_BIN = $(DEPS_PREFIX)/bin
+DEPS_LIB = $(DEPS_PREFIX)/lib
+DEPS_INC = $(DEPS_PREFIX)/include
+
+LIBMUSL = musl-1.1.14
+LIBMUSL_SHA1 = b71208e87e66ac959d0e413dd444279d28a7bff1
+
+LIBNCURSES = ncurses-6.0
+LIBNCURSES_SHA1 = acd606135a5124905da770803c05f1f20dd3b21c
+
+LIBTERMKEY = libtermkey-0.18
+LIBTERMKEY_SHA1 = 0a78ba7aaa2f3b53f2273268366fef349c9be4ab
+
+#LIBLUA = lua-5.3.1
+#LIBLUA_SHA1 = 1676c6a041d90b6982db8cef1e5fb26000ab6dee
+LIBLUA = lua-5.2.4
+LIBLUA_SHA1 = ef15259421197e3d85b7d6e4871b8c26fd82c1cf
+#LIBLUA = lua-5.1.5
+#LIBLUA_SHA1 = b3882111ad02ecc6b972f8c1241647905cb2e3fc
+
+LIBLPEG = lpeg-1.0.0
+LIBLPEG_SHA1 = 64a0920c9243b624a277c987d2219b6c50c43971
+
+LIBNCURSES_CONFIG = --disable-database --with-fallbacks=st,st-256color,xterm,xterm-256color,vt100 \
+	--with-shared --enable-widec --enable-ext-colors --with-termlib=tinfo \
+	--without-ada --without-cxx --without-cxx-binding --without-manpages --without-progs \
+	--without-tests --without-progs --without-debug --without-profile \
+	--without-cxx-shared --without-termlib --without--ticlib
+
+dependency/sources:
+	mkdir -p $@
+
+dependency/sources/musl-%: | dependency/sources
+	wget -c -O $@.part http://www.musl-libc.org/releases/$(LIBMUSL).tar.gz
+	mv $@.part $@
+	[ -z $(LIBMUSL_SHA1) ] || (echo '$(LIBMUSL_SHA1)  $@' | sha1sum -c)
+
+dependency/sources/extract-libmusl: dependency/sources/$(LIBMUSL).tar.gz
+	tar xzf $< -C $(dir $<)
+	touch $@
+
+dependency/sources/configure-libmusl: dependency/sources/extract-libmusl
+	cd $(dir $<)/$(LIBMUSL) && ./configure --prefix=$(DEPS_PREFIX) --syslibdir=$(DEPS_PREFIX)/lib
+	touch $@
+
+dependency/sources/build-libmusl: dependency/sources/configure-libmusl
+	$(MAKE) -C $(dir $<)/$(LIBMUSL)
+	touch $@
+
+dependency/sources/install-libmusl: dependency/sources/build-libmusl
+	$(MAKE) -C $(dir $<)/$(LIBMUSL) install
+	touch $@
+
+dependency/sources/ncurses-%: | dependency/sources
+	wget -c -O $@.part http://ftp.gnu.org/gnu/ncurses/$(LIBNCURSES).tar.gz
+	mv $@.part $@
+	[ -z $(LIBNCURSES_SHA1) ] || (echo '$(LIBNCURSES_SHA1)  $@' | sha1sum -c)
+
+dependency/sources/extract-libncurses: dependency/sources/$(LIBNCURSES).tar.gz
+	tar xzf $< -C $(dir $<)
+	touch $@
+
+dependency/sources/configure-libncurses: dependency/sources/extract-libncurses
+	cd $(dir $<)/$(LIBNCURSES) && ./configure --prefix=/usr --libdir=/usr/lib $(LIBNCURSES_CONFIG)
+	touch $@
+
+dependency/sources/build-libncurses: dependency/sources/configure-libncurses
+	$(MAKE) -C $(dir $<)/$(LIBNCURSES)
+	touch $@
+
+dependency/sources/install-libncurses: dependency/sources/build-libncurses
+	$(MAKE) -C $(dir $<)/$(LIBNCURSES) install.libs DESTDIR=$(DEPS_ROOT)
+	touch $@
+
+dependency/sources/libtermkey-%: | dependency/sources
+	wget -c -O $@.part http://www.leonerd.org.uk/code/libtermkey/$(LIBTERMKEY).tar.gz
+	mv $@.part $@
+	[ -z $(LIBTERMKEY_SHA1) ] || (echo '$(LIBTERMKEY_SHA1)  $@' | sha1sum -c)
+
+dependency/sources/extract-libtermkey: dependency/sources/$(LIBTERMKEY).tar.gz
+	tar xzf $< -C $(dir $<)
+	touch $@
+
+dependency/sources/build-libtermkey: dependency/sources/extract-libtermkey
+	# TODO no sane way to avoid pkg-config and specify LDFLAGS?
+	sed -i 's/LDFLAGS+=-lncurses$$/LDFLAGS+=-lncursesw/g' $(dir $<)/$(LIBTERMKEY)/Makefile
+	$(MAKE) -C $(dir $<)/$(LIBTERMKEY) PREFIX=$(DEPS_PREFIX) termkey.h libtermkey.la
+	touch $@
+
+dependency/sources/install-libtermkey: dependency/sources/build-libtermkey
+	$(MAKE) -C $(dir $<)/$(LIBTERMKEY) PREFIX=$(DEPS_PREFIX) install-inc install-lib
+	touch $@
+
+dependency/sources/lua-%: | dependency/sources
+	wget -c -O $@.part http://www.lua.org/ftp/$(LIBLUA).tar.gz
+	mv $@.part $@
+	[ -z $(LIBLUA_SHA1) ] || (echo '$(LIBLUA_SHA1)  $@' | sha1sum -c)
+
+dependency/sources/extract-liblua: dependency/sources/$(LIBLUA).tar.gz
+	tar xzf $< -C $(dir $<)
+	touch $@
+
+dependency/sources/patch-liblua: dependency/sources/extract-liblua
+	cd $(dir $<) && ([ -e $(LIBLUA)-lpeg.patch ] || wget http://www.brain-dump.org/projects/vis/$(LIBLUA)-lpeg.patch)
+	cd $(dir $<)/$(LIBLUA) && patch -p1 < ../$(LIBLUA)-lpeg.patch
+	touch $@
+
+dependency/sources/build-liblua: dependency/sources/patch-liblua dependency/sources/install-liblpeg
+	$(MAKE) -C $(dir $<)/$(LIBLUA)/src all CC=$(CC) MYCFLAGS="-DLUA_COMPAT_5_1 -DLUA_COMPAT_5_2 -DLUA_COMPAT_ALL -DLUA_USE_POSIX -DLUA_USE_DLOPEN -fPIC" MYLIBS="-Wl,-E -ldl -lncursesw -lm"
+	#$(MAKE) -C $(dir $<)/$(LIBLUA) posix CC=$(CC)
+	touch $@
+
+dependency/sources/install-liblua: dependency/sources/build-liblua
+	$(MAKE) -C $(dir $<)/$(LIBLUA) INSTALL_TOP=$(DEPS_PREFIX) install
+	touch $@
+
+dependency/sources/lpeg-%: | dependency/sources
+	wget -c -O $@.part http://www.inf.puc-rio.br/~roberto/lpeg/$(LIBLPEG).tar.gz
+	mv $@.part $@
+	[ -z $(LIBLPEG_SHA1) ] || (echo '$(LIBLPEG_SHA1)  $@' | sha1sum -c)
+
+dependency/sources/extract-liblpeg: dependency/sources/$(LIBLPEG).tar.gz
+	tar xzf $< -C $(dir $<)
+	touch $@
+
+dependency/sources/build-liblpeg: dependency/sources/extract-liblpeg
+	$(MAKE) -C $(dir $<)/$(LIBLPEG) LUADIR=../$(LIBLUA)/src CC=$(CC)
+	touch $@
+
+dependency/sources/install-liblpeg: dependency/sources/build-liblpeg dependency/sources/extract-liblua
+	cp $(dir $<)/$(LIBLPEG)/*.o $(dir $<)/$(LIBLUA)/src
+	touch $@
+
+dependencies: dependency/sources/install-libtermkey dependency/sources/install-liblua dependency/sources/install-liblpeg
+
+dependencies-full: dependency/sources/install-libncurses dependencies
+
+local: clean dependencies
+	$(MAKE) CFLAGS="$(CFLAGS) -I$(DEPS_INC)" LDFLAGS="$(LDFLAGS) -L$(DEPS_LIB)" \
+		CFLAGS_CURSES="-I/usr/include/ncursesw" LDFLAGS_CURSES="-lncursesw" \
+		CFLAGS_TERMKEY=	LDFLAGS_TERMKEY=-ltermkey \
+		CFLAGS_LUA="-DLUA_COMPAT_5_1 -DLUA_COMPAT_5_2 -DLUA_COMPAT_ALL" \
+		LDFLAGS_LUA="-llua -lm -ldl"
+	@echo Run with: LD_LIBRARY_PATH=$(DEPS_LIB) VIS_PATH=. ./vis
+
+standalone: clean dependency/sources/install-libmusl
+	PATH=$(DEPS_BIN):$$PATH PKG_CONFIG_PATH= PKG_CONFIG_LIBDIR= $(MAKE) \
+		CC=musl-gcc dependencies-full
+	PATH=$(DEPS_BIN):$$PATH PKG_CONFIG_PATH= PKG_CONFIG_LIBDIR= $(MAKE) \
+		CC=musl-gcc CFLAGS="--static -Wl,--as-needed" \
+		CFLAGS_CURSES= LDFLAGS_CURSES="-lncursesw" \
+		CFLAGS_TERMKEY= LDFLAGS_TERMKEY=-ltermkey \
+		CFLAGS_LUA="-DLUA_COMPAT_5_1 -DLUA_COMPAT_5_2 -DLUA_COMPAT_ALL" \
+		LDFLAGS_LUA="-llua -lm -ldl" \
+		CONFIG_ACL=0 CFLAGS_ACL= LDFLAGS_ACL= \
+		CONFIG_SELINUX=0 CFLAGS_SELINUX= LDFLAGS_SELINUX=
+	@echo Run with: VIS_PATH=. ./vis
+
+.PHONY: standalone dependencies dependencies-full local
\ No newline at end of file
diff --git a/Makefile b/Makefile
index 8066823..7962195 100644
--- a/Makefile
+++ b/Makefile
@@ -1,61 +1,38 @@
-include config.mk
-
-# try to get a tag and hash first
-GITHASH = $(shell git log -1 --format='%h' 2>/dev/null)
-GITTAG = $(shell git describe --abbrev=0 --tags 2>/dev/null)
-ifneq ($(GITTAG),)
-	# we have a tag and revcount from there
-	GITREVCOUNT = $(shell git rev-list --count ${GITTAG}.. 2>/dev/null)
-	VERSION = ${GITTAG}.r${GITREVCOUNT}.g${GITHASH}
-else ifneq ($(GITHASH),)
-	# we have no tags in git, so just use revision count an hash for now
-	GITREVCOUNT = $(shell git rev-list --count HEAD)
-	VERSION = 0.r${GITREVCOUNT}.g${GITHASH}
-endif
-
-SRCDIR = $(realpath $(dir $(firstword $(MAKEFILE_LIST))))
-
-ALL = *.c *.h config.mk Makefile LICENSE README.md vis.1
-
-DEPS_ROOT = $(SRCDIR)/dependency/install
-DEPS_PREFIX = $(DEPS_ROOT)/usr
-DEPS_BIN = $(DEPS_PREFIX)/bin
-DEPS_LIB = $(DEPS_PREFIX)/lib
-DEPS_INC = $(DEPS_PREFIX)/include
-
-LIBMUSL = musl-1.1.14
-LIBMUSL_SHA1 = b71208e87e66ac959d0e413dd444279d28a7bff1
-
-LIBNCURSES = ncurses-6.0
-LIBNCURSES_SHA1 = acd606135a5124905da770803c05f1f20dd3b21c
-
-LIBTERMKEY = libtermkey-0.18
-LIBTERMKEY_SHA1 = 0a78ba7aaa2f3b53f2273268366fef349c9be4ab
-
-#LIBLUA = lua-5.3.1
-#LIBLUA_SHA1 = 1676c6a041d90b6982db8cef1e5fb26000ab6dee
-LIBLUA = lua-5.2.4
-LIBLUA_SHA1 = ef15259421197e3d85b7d6e4871b8c26fd82c1cf
-#LIBLUA = lua-5.1.5
-#LIBLUA_SHA1 = b3882111ad02ecc6b972f8c1241647905cb2e3fc
-
-LIBLPEG = lpeg-1.0.0
-LIBLPEG_SHA1 = 64a0920c9243b624a277c987d2219b6c50c43971
-
-LIBNCURSES_CONFIG = --disable-database --with-fallbacks=st,st-256color,xterm,xterm-256color,vt100 \
-	--with-shared --enable-widec --enable-ext-colors --with-termlib=tinfo \
-	--without-ada --without-cxx --without-cxx-binding --without-manpages --without-progs \
-	--without-tests --without-progs --without-debug --without-profile \
-	--without-cxx-shared --without-termlib --without--ticlib
+-include config.mk
+
+VERSION = $(shell git describe 2>/dev/null || echo "0.1.x")
+
+CONFIG_LUA ?= 1
+CONFIG_ACL ?= 0
+CONFIG_SELINUX ?= 0
+
+CFLAGS_STD ?= -std=c99 -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700 -DNDEBUG -Os
+LDFLAGS_STD ?= -lc
+
+CFLAGS_VIS = $(CFLAGS_AUTO) $(CFLAGS_TERMKEY) $(CFLAGS_CURSES) $(CFLAGS_ACL) \
+	$(CFLAGS_SELINUX) $(CFLAGS_LUA) $(CFLAGS_STD)
+
+CFLAGS_VIS += -DVERSION=\"${VERSION}\"
+CFLAGS_VIS += -DCONFIG_LUA=${CONFIG_LUA}
+CFLAGS_VIS += -DCONFIG_SELINUX=${CONFIG_SELINUX}
+CFLAGS_VIS += -DCONFIG_ACL=${CONFIG_ACL}
+
+LDFLAGS_VIS = $(LDFLAGS_AUTO) $(LDFLAGS_TERMKEY) $(LDFLAGS_CURSES) $(LDFLAGS_ACL) \
+	$(LDFLAGS_SELINUX) $(LDFLAGS_LUA) $(LDFLAGS_STD)
+
+DEBUG_CFLAGS_VIS = ${CFLAGS_VIS} -UNDEBUG -O0 -g -ggdb -Wall -Wextra -pedantic \
+	-Wno-missing-field-initializers -Wno-unused-parameter
+
+STRIP?=strip
+
 
 all: vis
 
 config.h:
 	cp config.def.h config.h
 
-vis: config.h config.mk *.c *.h
-	@echo ${CC} ${CFLAGS} ${CFLAGS_VIS} *.c ${LDFLAGS} ${LDFLAGS_VIS} -o $@
-	@${CC} ${CFLAGS} ${CFLAGS_VIS} *.c ${LDFLAGS} ${LDFLAGS_VIS} -o $@
+vis: config.h *.c *.h
+	${CC} ${CFLAGS} ${CFLAGS_VIS} *.c ${LDFLAGS} ${LDFLAGS_VIS} -o $@
 
 debug: clean
 	@$(MAKE) CFLAGS_VIS='${DEBUG_CFLAGS_VIS}'
@@ -103,121 +80,4 @@ uninstall:
 	@echo removing support files from ${DESTDIR}${SHAREPREFIX}
 	@[ ! -z "${SHAREPREFIX}" ] && rm -rf ${DESTDIR}${SHAREPREFIX}
 
-dependency/sources:
-	mkdir -p $@
-
-dependency/sources/musl-%: | dependency/sources
-	wget -c -O $@.part http://www.musl-libc.org/releases/$(LIBMUSL).tar.gz
-	mv $@.part $@
-	[ -z $(LIBMUSL_SHA1) ] || (echo '$(LIBMUSL_SHA1)  $@' | sha1sum -c)
-
-dependency/sources/extract-libmusl: dependency/sources/$(LIBMUSL).tar.gz
-	tar xzf $< -C $(dir $<)
-	touch $@
-
-dependency/sources/configure-libmusl: dependency/sources/extract-libmusl
-	cd $(dir $<)/$(LIBMUSL) && ./configure --prefix=$(DEPS_PREFIX) --syslibdir=$(DEPS_PREFIX)/lib
-	touch $@
-
-dependency/sources/build-libmusl: dependency/sources/configure-libmusl
-	$(MAKE) -C $(dir $<)/$(LIBMUSL)
-	touch $@
-
-dependency/sources/install-libmusl: dependency/sources/build-libmusl
-	$(MAKE) -C $(dir $<)/$(LIBMUSL) install
-	touch $@
-
-dependency/sources/ncurses-%: | dependency/sources
-	wget -c -O $@.part http://ftp.gnu.org/gnu/ncurses/$(LIBNCURSES).tar.gz
-	mv $@.part $@
-	[ -z $(LIBNCURSES_SHA1) ] || (echo '$(LIBNCURSES_SHA1)  $@' | sha1sum -c)
-
-dependency/sources/extract-libncurses: dependency/sources/$(LIBNCURSES).tar.gz
-	tar xzf $< -C $(dir $<)
-	touch $@
-
-dependency/sources/configure-libncurses: dependency/sources/extract-libncurses
-	cd $(dir $<)/$(LIBNCURSES) && ./configure --prefix=/usr --libdir=/usr/lib $(LIBNCURSES_CONFIG)
-	touch $@
-
-dependency/sources/build-libncurses: dependency/sources/configure-libncurses
-	$(MAKE) -C $(dir $<)/$(LIBNCURSES)
-	touch $@
-
-dependency/sources/install-libncurses: dependency/sources/build-libncurses
-	$(MAKE) -C $(dir $<)/$(LIBNCURSES) install.libs DESTDIR=$(DEPS_ROOT)
-	touch $@
-
-dependency/sources/libtermkey-%: | dependency/sources
-	wget -c -O $@.part http://www.leonerd.org.uk/code/libtermkey/$(LIBTERMKEY).tar.gz
-	mv $@.part $@
-	[ -z $(LIBTERMKEY_SHA1) ] || (echo '$(LIBTERMKEY_SHA1)  $@' | sha1sum -c)
-
-dependency/sources/extract-libtermkey: dependency/sources/$(LIBTERMKEY).tar.gz
-	tar xzf $< -C $(dir $<)
-	touch $@
-
-dependency/sources/build-libtermkey: dependency/sources/extract-libtermkey
-	# TODO no sane way to avoid pkg-config and specify LDFLAGS?
-	sed -i 's/LDFLAGS+=-lncurses$$/LDFLAGS+=-lncursesw/g' $(dir $<)/$(LIBTERMKEY)/Makefile
-	$(MAKE) -C $(dir $<)/$(LIBTERMKEY) PREFIX=$(DEPS_PREFIX) termkey.h libtermkey.la
-	touch $@
-
-dependency/sources/install-libtermkey: dependency/sources/build-libtermkey
-	$(MAKE) -C $(dir $<)/$(LIBTERMKEY) PREFIX=$(DEPS_PREFIX) install-inc install-lib
-	touch $@
-
-dependency/sources/lua-%: | dependency/sources
-	wget -c -O $@.part http://www.lua.org/ftp/$(LIBLUA).tar.gz
-	mv $@.part $@
-	[ -z $(LIBLUA_SHA1) ] || (echo '$(LIBLUA_SHA1)  $@' | sha1sum -c)
-
-dependency/sources/extract-liblua: dependency/sources/$(LIBLUA).tar.gz
-	tar xzf $< -C $(dir $<)
-	touch $@
-
-dependency/sources/patch-liblua: dependency/sources/extract-liblua
-	cd $(dir $<) && ([ -e $(LIBLUA)-lpeg.patch ] || wget http://www.brain-dump.org/projects/vis/$(LIBLUA)-lpeg.patch)
-	cd $(dir $<)/$(LIBLUA) && patch -p1 < ../$(LIBLUA)-lpeg.patch
-	touch $@
-
-dependency/sources/build-liblua: dependency/sources/patch-liblua dependency/sources/install-liblpeg
-	$(MAKE) -C $(dir $<)/$(LIBLUA)/src all CC=$(CC) MYCFLAGS="-DLUA_COMPAT_5_1 -DLUA_COMPAT_5_2 -DLUA_COMPAT_ALL -DLUA_USE_POSIX -DLUA_USE_DLOPEN -fPIC" MYLIBS="-Wl,-E -ldl -lncursesw -lm"
-	#$(MAKE) -C $(dir $<)/$(LIBLUA) posix CC=$(CC)
-	touch $@
-
-dependency/sources/install-liblua: dependency/sources/build-liblua
-	$(MAKE) -C $(dir $<)/$(LIBLUA) INSTALL_TOP=$(DEPS_PREFIX) install
-	touch $@
-
-dependency/sources/lpeg-%: | dependency/sources
-	wget -c -O $@.part http://www.inf.puc-rio.br/~roberto/lpeg/$(LIBLPEG).tar.gz
-	mv $@.part $@
-	[ -z $(LIBLPEG_SHA1) ] || (echo '$(LIBLPEG_SHA1)  $@' | sha1sum -c)
-
-dependency/sources/extract-liblpeg: dependency/sources/$(LIBLPEG).tar.gz
-	tar xzf $< -C $(dir $<)
-	touch $@
-
-dependency/sources/build-liblpeg: dependency/sources/extract-liblpeg
-	$(MAKE) -C $(dir $<)/$(LIBLPEG) LUADIR=../$(LIBLUA)/src CC=$(CC)
-	touch $@
-
-dependency/sources/install-liblpeg: dependency/sources/build-liblpeg dependency/sources/extract-liblua
-	cp $(dir $<)/$(LIBLPEG)/*.o $(dir $<)/$(LIBLUA)/src
-	touch $@
-
-dependencies: dependency/sources/install-libtermkey dependency/sources/install-liblua dependency/sources/install-liblpeg
-
-dependencies-full: dependency/sources/install-libncurses dependencies
-
-local: dependencies
-	CFLAGS="$(CFLAGS) -I$(DEPS_INC)" LDFLAGS="$(LDFLAGS) -L$(DEPS_LIB)" $(MAKE) CFLAGS_LUA= CFLAGS_TERMKEY= LDFLAGS_LUA="-llua -lm" LDFLAGS_TERMKEY=-ltermkey
-	@echo Run with: LD_LIBRARY_PATH=$(DEPS_LIB) VIS_PATH=. ./vis
-
-standalone: dependency/sources/install-libmusl
-	PATH=$(DEPS_BIN):$$PATH CC=musl-gcc PKG_CONFIG_PATH= PKG_CONFIG_LIBDIR= CFLAGS=-I$(DEPS_INC)/ncursesw $(MAKE) dependencies-full
-	PATH=$(DEPS_BIN):$$PATH CC=musl-gcc PKG_CONFIG_PATH= PKG_CONFIG_LIBDIR= CFLAGS="--static -Wl,--as-needed -I$(DEPS_INC)/ncursesw" $(MAKE) CFLAGS_LIBS= debug
-	@echo Run with: VIS_PATH=. ./vis
-
-.PHONY: all clean dist install uninstall debug profile standalone dependencies dependencies-full local
+.PHONY: all clean dist install uninstall debug profile
diff --git a/README.md b/README.md
index c0bc823..367d020 100644
--- a/README.md
+++ b/README.md
@@ -41,24 +41,26 @@ In order to build vis you will need a C99 compiler as well as:
  * [libcurses](http://www.gnu.org/software/ncurses/), preferably in the
    wide-character version
  * [libtermkey](http://www.leonerd.org.uk/code/libtermkey/)
- * [lua](http://www.lua.org/) >= 5.2
- * [LPeg](http://www.inf.puc-rio.br/~roberto/lpeg/) >= 0.12 (runtime
-   dependency required for syntax highlighting)
-
-If you want a self contained statically linked binary you can try
-to run `make standalone` which will attempt to download, compile
-and install all of the above dependencies. `make local` will do
-the same but only for libtermkey, lua and LPeg (i.e. the system
-C and curses libraries are used).
-
-To build a regular dynamically linked binary using the system
-libraries, simply run `make` (possibly after adapting `config.mk`
-to match your system).
-
-    $ $EDITOR config.mk
-    $ make
+ * [lua](http://www.lua.org/) >= 5.2 (optional)
+ * [LPeg](http://www.inf.puc-rio.br/~roberto/lpeg/) >= 0.12
+   (optional runtime dependency required for syntax highlighting)
+
+Assuming these dependencies are met, execute:
+
+    $ ./configure && make
     $ VIS_PATH=. ./vis config.h
 
+By default the `configure` script will try to auto detect support for
+Lua. See `configure --help` for a list of supported options. You can
+also manually tweak the generated `config.mk` file.
+
+On Linux based systems `make standalone` will attempt to download,
+compile and install all of the above dependencies into a subfolder
+inorder to build a self contained statically linked binary.
+
+`make local` will do the same but only for libtermkey, Lua and LPeg
+(i.e. the system C and curses libraries are used).
+
 Editing Features
 ================
 
diff --git a/config.mk b/config.mk
deleted file mode 100644
index bdc1702..0000000
--- a/config.mk
+++ /dev/null
@@ -1,68 +0,0 @@
-# vis version
-VERSION = 0.1
-
-# optional features
-CONFIG_LUA=1
-CONFIG_ACL=0
-CONFIG_SELINUX=0
-
-# Customize below to fit your system
-
-PREFIX ?= /usr/local
-MANPREFIX = ${PREFIX}/share/man
-SHAREPREFIX = ${PREFIX}/share/vis
-
-LIBS = -lc
-
-CFLAGS_TERMKEY = $(shell pkg-config --cflags termkey 2> /dev/null || echo "")
-LDFLAGS_TERMKEY = $(shell pkg-config --libs termkey 2> /dev/null || echo "-ltermkey")
-
-CFLAGS_CURSES = $(shell pkg-config --cflags ncursesw 2> /dev/null || echo "-I/usr/include/ncursesw")
-LDFLAGS_CURSES = $(shell pkg-config --libs ncursesw 2> /dev/null || echo "-lncursesw")
-
-ifeq (${CONFIG_LUA},1)
-	CFLAGS_LUA = $(shell pkg-config --cflags lua5.2 2> /dev/null || echo "-I/usr/include/lua5.2")
-	LDFLAGS_LUA = $(shell pkg-config --libs lua5.2 2> /dev/null || echo "-llua -lm")
-endif
-
-ifeq (${CONFIG_ACL},1)
-	LIBS += -lacl
-endif
-
-OS = $(shell uname)
-
-ifeq (${OS},Linux)
-	ifeq (${CONFIG_SELINUX},1)
-		LIBS += -lselinux
-	endif
-else ifeq (${OS},Darwin)
-	CFLAGS += -D_DARWIN_C_SOURCE
-else ifeq (${OS},OpenBSD)
-	CFLAGS += -D_BSD_SOURCE
-else ifeq (${OS},FreeBSD)
-	CFLAGS += -D_BSD_SOURCE
-else ifeq (${OS},NetBSD)
-	CFLAGS += -D_BSD_SOURCE
-else ifeq (${OS},AIX)
-	CFLAGS += -D_ALL_SOURCE
-endif
-
-CFLAGS_LIBS = $(CFLAGS_LUA) $(CFLAGS_TERMKEY) $(CFLAGS_CURSES)
-LDFLAGS_LIBS = $(LDFLAGS_LUA) $(LDFLAGS_TERMKEY) $(LDFLAGS_CURSES) $(LIBS)
-
-CFLAGS_STD = -std=c99 -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700
-
-CFLAGS_VIS = $(CFLAGS_LIBS) $(CFLAGS_STD) -Os -DVERSION=\"${VERSION}\" -DNDEBUG
-CFLAGS_VIS += -DCONFIG_LUA=${CONFIG_LUA}
-CFLAGS_VIS += -DCONFIG_SELINUX=${CONFIG_SELINUX}
-CFLAGS_VIS += -DCONFIG_ACL=${CONFIG_ACL}
-ifeq (${CONFIG_LUA},1)
-	CFLAGS_VIS += -DLUA_COMPAT_5_1 -DLUA_COMPAT_5_2 -DLUA_COMPAT_ALL
-endif
-
-LDFLAGS_VIS = $(LDFLAGS_LIBS)
-
-DEBUG_CFLAGS_VIS = ${CFLAGS_VIS} -UNDEBUG -O0 -g -ggdb -Wall -Wextra -pedantic -Wno-missing-field-initializers -Wno-unused-parameter
-
-CC ?= cc
-STRIP ?= strip
diff --git a/configure b/configure
new file mode 100755
index 0000000..13d155a
--- /dev/null
+++ b/configure
@@ -0,0 +1,449 @@
+#!/bin/sh
+# Based on the configure script from musl libc, MIT licensed
+
+usage () {
+cat <<EOF
+Usage: $0 [OPTION]... [VAR=VALUE]...
+
+To assign environment variables (e.g., CC, CFLAGS...), specify them as
+VAR=VALUE.  See below for descriptions of some of the useful variables.
+
+Defaults for the options are specified in brackets.
+
+Configuration:
+  --srcdir=DIR            source directory [detected]
+
+Installation directories:
+  --prefix=PREFIX         main installation prefix [/usr/local]
+  --exec-prefix=EPREFIX   installation prefix for executable files [PREFIX]
+
+Fine tuning of the installation directories:
+  --bindir=DIR            user executables [EPREFIX/bin]
+
+Optional features:
+  --enable-lua            build with Lua support [auto]
+  --enable-selinux        build with SELinux support [auto]
+  --enable-acl            build with POSIX ACL support [auto]
+
+Some influential environment variables:
+  CC                      C compiler command [detected]
+  CFLAGS                  C compiler flags [-Os -pipe ...]
+  LDFLAGS                 Linker flags
+
+Use these variables to override the choices made by configure.
+
+EOF
+exit 0
+}
+
+# Helper functions
+
+quote () {
+tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; }
+$1
+EOF
+printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#"
+}
+echo () { printf "%s\n" "$*" ; }
+fail () { echo "$*" ; exit 1 ; }
+fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
+cmdexists () { type "$1" >/dev/null 2>&1 ; }
+trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; }
+
+stripdir () {
+while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done
+}
+
+trycppif () {
+printf "checking preprocessor condition %s... " "$1"
+echo "typedef int x;" > "$tmpc"
+echo "#if $1" >> "$tmpc"
+echo "#error yes" >> "$tmpc"
+echo "#endif" >> "$tmpc"
+if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
+printf "false\n"
+return 1
+else
+printf "true\n"
+return 0
+fi
+}
+
+tryflag () {
+printf "checking whether compiler accepts %s... " "$2"
+echo "typedef int x;" > "$tmpc"
+if $CC $CFLAGS_TRY $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
+printf "yes\n"
+eval "$1=\"\${$1} \$2\""
+eval "$1=\${$1# }"
+return 0
+else
+printf "no\n"
+return 1
+fi
+}
+
+tryldflag () {
+printf "checking whether linker accepts %s... " "$2"
+echo "typedef int x;" > "$tmpc"
+if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
+printf "yes\n"
+eval "$1=\"\${$1} \$2\""
+eval "$1=\${$1# }"
+return 0
+else
+printf "no\n"
+return 1
+fi
+}
+
+# Beginning of actual script
+
+CFLAGS_AUTO=
+CFLAGS_TRY=
+LDFLAGS_AUTO=
+LDFLAGS_TRY=
+srcdir=
+prefix=/usr/local
+exec_prefix='$(prefix)'
+bindir='$(exec_prefix)/bin'
+
+lua=auto
+selinux=auto
+acl=auto
+
+for arg ; do
+case "$arg" in
+--help|-h) usage ;;
+--srcdir=*) srcdir=${arg#*=} ;;
+--prefix=*) prefix=${arg#*=} ;;
+--exec-prefix=*) exec_prefix=${arg#*=} ;;
+--bindir=*) bindir=${arg#*=} ;;
+--enable-lua|--enable-lua=yes) lua=yes ;;
+--disable-lua|--enable-lua=no) lua=no ;;
+--enable-selinux|--enable-selinux=yes) selinux=yes ;;
+--disable-selinux|--enable-selinux=no) selinux=no ;;
+--enable-acl|--enable-acl=yes) acl=yes ;;
+--disable-acl|--enable-acl=no) acl=no ;;
+--enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
+-* ) echo "$0: unknown option $arg" ;;
+CC=*) CC=${arg#*=} ;;
+CFLAGS=*) CFLAGS=${arg#*=} ;;
+CPPFLAGS=*) CPPFLAGS=${arg#*=} ;;
+LDFLAGS=*) LDFLAGS=${arg#*=} ;;
+*=*) ;;
+*) ;;
+esac
+done
+
+for i in srcdir prefix exec_prefix bindir ; do
+stripdir $i
+done
+
+#
+# Get the source dir for out-of-tree builds
+#
+if test -z "$srcdir" ; then
+srcdir="${0%/configure}"
+stripdir srcdir
+fi
+abs_builddir="$(pwd)" || fail "$0: cannot determine working directory"
+abs_srcdir="$(cd $srcdir && pwd)" || fail "$0: invalid source directory $srcdir"
+test "$abs_srcdir" = "$abs_builddir" && srcdir=.
+test "$srcdir" != "." -a -f Makefile -a ! -h Makefile && fail "$0: Makefile already exists in the working directory"
+
+#
+# Get a temp filename we can use
+#
+i=0
+set -C
+while : ; do i=$(($i+1))
+tmpc="./conf$$-$PPID-$i.c"
+2>|/dev/null > "$tmpc" && break
+test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc"
+done
+set +C
+trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP
+
+#
+# Find a C compiler to use
+#
+printf "checking for C compiler... "
+trycc c99
+trycc cc
+trycc gcc
+printf "%s\n" "$CC"
+test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; }
+
+printf "checking whether C compiler works... "
+echo "typedef int x;" > "$tmpc"
+if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then
+printf "yes\n"
+else
+printf "no; compiler output follows:\n%s\n" "$output"
+exit 1
+fi
+
+#
+# Figure out options to force errors on unknown flags.
+#
+tryflag   CFLAGS_TRY  -Werror=unknown-warning-option
+tryflag   CFLAGS_TRY  -Werror=unused-command-line-argument
+tryldflag LDFLAGS_TRY -Werror=unknown-warning-option
+tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
+
+CFLAGS_STD="-std=c99 -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700 -DNDEBUG -Os"
+LDFLAGS_STD="-lc"
+
+OS=$(uname)
+
+case "$OS" in
+*BSD)   CFLAGS_STD+=-D_DARWIN_C_SOURCE ;;
+Darwin) CFLAGS_STD+=-D_BSD_SOURCE ;;
+AIX)    CFLAGS_STD+=-D_ALL_SOURCE ;;
+esac
+
+have_pkgconfig=no
+printf "checking for pkg-config... "
+cmdexists pkg-config && have_pkgconfig=yes
+printf "%s\n" "$have_pkgconfig"
+
+tryflag CFLAGS_AUTO -pipe
+
+# libcurses is a mandatory dependency
+
+printf "checking for libcurses...\n"
+cat > "$tmpc" <<EOF
+#include <curses.h>
+
+int main(int argc, char *argv[]) {
+	initscr();
+	endwin();
+	return 0;
+}
+EOF
+
+CONFIG_CURSES=0
+
+for curses in ncursesw ncurses curses; do
+	printf " checking for %s... " "$curses"
+
+	if test "$have_pkgconfig" = "yes" ; then
+		CFLAGS_CURSES=$(pkg-config --cflags $curses 2>/dev/null)
+		LDFLAGS_CURSES=$(pkg-config --libs $curses 2>/dev/null)
+		if $? -a $CC $CFLAGS $LDFLAGS $CFLAGS_CURSES $LDFLAGS_CURSES \
+			-o /dev/null "$tmpc" >/dev/null 2>&1 ; then
+			CONFIG_CURSES=1
+			printf "yes\n"
+			break
+		fi
+	fi
+
+	CFLAGS_CURSES="-I/usr/include/$curses"
+	LDFLAGS_CURSES="-l$curses"
+
+	if $CC $CFLAGS $LDFLAGS $CFLAGS_CURSES $LDFLAGS_CURSES \
+		-o /dev/null "$tmpc" >/dev/null 2>&1 ; then
+		CONFIG_CURSES=1
+		printf "yes\n"
+		break
+	else
+		printf "no\n"
+	fi
+done
+
+test $CONFIG_CURSES -ne 1 && fail "$0: cannot find libcurses"
+
+# libtermkey is a mandatory dependency
+
+printf "checking for libtermkey... "
+cat > "$tmpc" <<EOF
+#include <termkey.h>
+
+int main(int argc, char *argv[]) {
+	TERMKEY_CHECK_VERSION;
+	return 0;
+}
+EOF
+
+if test "$have_pkgconfig" = "yes" ; then
+	CFLAGS_TERMKEY=$(pkg-config --cflags termkey 2>/dev/null)
+	LDFLAGS_TERMKEY=$(pkg-config --libs termkey 2>/dev/null)
+fi
+
+if test -z "$LDFLAGS_TERMKEY"; then
+	CFLAGS_TERMKEY=""
+	LDFLAGS_TERMKEY="-ltermkey"
+fi
+
+if $CC $CFLAGS $CFLAGS_TERMKEY $LDFLAGS $LDFLAGS_TERMKEY \
+	-o /dev/null "$tmpc" >/dev/null 2>&1; then
+	printf "%s\n" "yes"
+else
+	printf "%s\n" "no"
+	fail "$0: cannot find libtermkey"
+fi
+
+CONFIG_LUA=0
+
+if test "$lua" != "no" ; then
+
+	printf "checking for liblua...\n"
+
+cat > "$tmpc" <<EOF
+#include <lua.h>
+#include <lauxlib.h>
+
+int main(int argc, char *argv[]) {
+	lua_State *L = luaL_newstate();
+	luaL_openlibs(L);
+	lua_close(L);
+	return 0;
+}
+EOF
+
+	for liblua in lua lua5.2 lua5.3; do
+		printf " checking for %s... " "$liblua"
+
+		if test "$have_pkgconfig" = "yes" ; then
+			CFLAGS_LUA=$(pkg-config --cflags $liblua 2>/dev/null)
+			LDFLAGS_LUA=$(pkg-config --libs $liblua 2>/dev/null)
+			if test $? -eq 0 && $CC $CFLAGS $LDFLAGS $CFLAGS_LUA $LDFLAGS_LUA \
+				-o /dev/null "$tmpc" >/dev/null 2>&1 ; then
+				CONFIG_LUA=1
+				printf "yes\n"
+				break
+			fi
+		fi
+
+		CFLAGS_LUA="-I/usr/include/$liblua"
+		LDFLAGS_LUA="-l$liblua -lm"
+
+		if $CC $CFLAGS $LDFLAGS $CFLAGS_LUA $LDFLAGS_LUA \
+			-o /dev/null "$tmpc" >/dev/null 2>&1 ; then
+			CONFIG_LUA=1
+			printf "yes\n"
+			break
+		else
+			printf "no\n"
+		fi
+	done
+
+	test "$lua" = "yes" -a $CONFIG_LUA -ne 1 && fail "$0: cannot find liblua"
+	test $CONFIG_LUA -eq 1 && CFLAGS_LUA+=" -DLUA_COMPAT_5_1 -DLUA_COMPAT_5_2 -DLUA_COMPAT_ALL"
+fi
+
+CONFIG_ACL=0
+
+if test "$OS" = "Linux" -a "$acl" != "no"; then
+	printf "checking for libacl... "
+
+cat > "$tmpc" <<EOF
+#include <sys/types.h>
+#include <sys/acl.h>
+
+int main(int argc, char *argv[]) {
+	acl_t acl = acl_get_fd(0);
+	return 0;
+}
+EOF
+
+	if test "$have_pkgconfig" = "yes" ; then
+		CFLAGS_ACL=$(pkg-config --cflags acl 2>/dev/null)
+		LDFLAGS_ACL=$(pkg-config --libs acl 2>/dev/null)
+	fi
+
+	if test -z "$LDFLAGS_ACL"; then
+		CFLAGS_ACL=""
+		LDFLAGS_ACL="-lacl"
+	fi
+
+	if $CC $CFLAGS $LDFLAGS $CFLAGS_ACL $LDFLAGS_ACL \
+		-o /dev/null "$tmpc" >/dev/null 2>&1; then
+		CONFIG_ACL=1
+		printf "%s\n" "yes"
+	else
+		printf "%s\n" "no"
+		CFLAGS_ACL=""
+		LDFLAGS_ACL=""
+		test "$acl" = "yes" && fail "$0: cannot find libacl"
+	fi
+fi
+
+CONFIG_SELINUX=0
+
+if test "$OS" = "Linux" -a "$selinux" != "no"; then
+	printf "checking for libselinux... "
+
+cat > "$tmpc" <<EOF
+#include <selinux/selinux.h>
+
+int main(int argc, char *argv[]) {
+	return is_selinux_enabled();
+}
+EOF
+
+	if test "$have_pkgconfig" = "yes" ; then
+		CFLAGS_SELINUX=$(pkg-config --cflags selinux 2>/dev/null)
+		LDFLAGS_SELINUX=$(pkg-config --libs selinux 2>/dev/null)
+	fi
+
+	if test -z "$LDFLAGS_SELINUX"; then
+		CFLAGS_SELINUX=""
+		LDFLAGS_SELINUX="-lselinux"
+	fi
+
+	if $CC $CFLAGS $LDFLAGS $CFLAGS_SELINUX $LDFLAGS_SELINUX \
+		-o /dev/null "$tmpc" >/dev/null 2>&1; then
+		CONFIG_SELINUX=1
+		printf "%s\n" "yes"
+	else
+		printf "%s\n" "no"
+		CFLAGS_SELINUX=""
+		LDFLAGS_SELINUX=""
+		test "$selinux" = "yes" && fail "$0: cannot find libselinux"
+	fi
+fi
+
+printf "creating config.mk... "
+
+cmdline=$(quote "$0")
+for i ; do cmdline="$cmdline $(quote "$i")" ; done
+
+exec 3>&1 1>config.mk
+
+cat << EOF
+# This version of config.mk was generated by:
+# $cmdline
+# Any changes made here will be lost if configure is re-run
+srcdir = $srcdir
+prefix = $prefix
+exec_prefix = $exec_prefix
+bindir = $bindir
+CC = $CC
+CFLAGS = $CFLAGS
+CFLAGS_STD = $CFLAGS_STD
+LDFLAGS_STD = $LDFLAGS_STD
+CFLAGS_AUTO = $CFLAGS_AUTO
+LDFLAGS_AUTO = $LDFLAGS_AUTO
+LDFLAGS = $LDFLAGS
+LDFLAGS_AUTO = $LDFLAGS_AUTO
+CFLAGS_CURSES = $CFLAGS_CURSES
+LDFLAGS_CURSES = $LDFLAGS_CURSES
+CFLAGS_TERMKEY = $CFLAGS_TERMKEY
+LDFLAGS_TERMKEY = $LDFLAGS_TERMKEY
+CONFIG_LUA = $CONFIG_LUA
+CFLAGS_LUA = $CFLAGS_LUA
+LDFLAGS_LUA = $LDFLAGS_LUA
+CONFIG_ACL = $CONFIG_ACL
+CFLAGS_ACL = $CFLAGS_ACL
+LDFLAGS_ACL = $LDFLAGS_ACL
+CONFIG_SELINUX = $CONFIG_SELINUX
+CFLAGS_SELINUX = $CFLAGS_SELINUX
+LDFLAGS_SELINUX = $LDFLAGS_SELINUX
+EOF
+exec 1>&3 3>&-
+
+test "$srcdir" = "." || ln -sf $srcdir/Makefile .
+
+printf "done\n"