Added ac_path_generic.m4.

diff --git a/m4/ac_path_generic.m4 b/m4/ac_path_generic.m4
new file mode 100644 (file)
index 0000000..27b55b3
--- /dev/null
+++ b/m4/ac_path_generic.m4
@@ -0,0 +1,136 @@
+dnl @synopsis AC_PATH_GENERIC(LIBRARY [, MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
+dnl
+dnl Runs a LIBRARY-config script and defines LIBRARY_CFLAGS and LIBRARY_LIBS
+dnl
+dnl The script must support `--cflags' and `--libs' args.
+dnl If MINIMUM-VERSION is specified, the script must also support the
+dnl `--version' arg.
+dnl If the `--with-library-[exec-]prefix' arguments to ./configure are given,
+dnl it must also support `--prefix' and `--exec-prefix'.
+dnl (In other words, it must be like gtk-config.)
+dnl
+dnl For example:
+dnl
+dnl    AC_PATH_GENERIC(Foo, 1.0.0)
+dnl
+dnl would run `foo-config --version' and check that it is at least 1.0.0
+dnl
+dnl If so, the following would then be defined:
+dnl
+dnl    FOO_CFLAGS to `foo-config --cflags`
+dnl    FOO_LIBS   to `foo-config --libs`
+dnl
+dnl At present there is no support for additional "MODULES" (see AM_PATH_GTK)
+dnl (shamelessly stolen from gtk.m4 and then hacked around a fair amount)
+dnl
+dnl @author Angus Lees <gusl@cse.unsw.edu.au>
+
+AC_DEFUN([AC_PATH_GENERIC],
+[dnl
+dnl we're going to need uppercase, lowercase and user-friendly versions of the
+dnl string `LIBRARY'
+pushdef([UP], translit([$1], [a-z], [A-Z]))dnl
+pushdef([DOWN], translit([$1], [A-Z], [a-z]))dnl
+
+dnl
+dnl Get the cflags and libraries from the LIBRARY-config script
+dnl
+AC_ARG_WITH(DOWN-prefix,[  --with-]DOWN[-prefix=PFX       Prefix where $1 is installed (optional)],
+        DOWN[]_config_prefix="$withval", DOWN[]_config_prefix="")
+AC_ARG_WITH(DOWN-exec-prefix,[  --with-]DOWN[-exec-prefix=PFX Exec prefix where $1 is installed (optional)],
+        DOWN[]_config_exec_prefix="$withval", DOWN[]_config_exec_prefix="")
+
+  if test x$DOWN[]_config_exec_prefix != x ; then
+     DOWN[]_config_args="$DOWN[]_config_args --exec-prefix=$DOWN[]_config_exec_prefix"
+     if test x${UP[]_CONFIG+set} != xset ; then
+       UP[]_CONFIG=$DOWN[]_config_exec_prefix/bin/DOWN-config
+     fi
+  fi
+  if test x$DOWN[]_config_prefix != x ; then
+     DOWN[]_config_args="$DOWN[]_config_args --prefix=$DOWN[]_config_prefix"
+     if test x${UP[]_CONFIG+set} != xset ; then
+       UP[]_CONFIG=$DOWN[]_config_prefix/bin/DOWN-config
+     fi
+  fi
+
+  AC_PATH_PROG(UP[]_CONFIG, DOWN-config, no)
+  ifelse([$2], ,
+     AC_MSG_CHECKING(for $1),
+     AC_MSG_CHECKING(for $1 - version >= $2)
+  )
+  no_[]DOWN=""
+  if test "$UP[]_CONFIG" = "no" ; then
+     no_[]DOWN=yes
+  else
+     UP[]_CFLAGS="`$UP[]_CONFIG $DOWN[]_config_args --cflags`"
+     UP[]_LIBS="`$UP[]_CONFIG $DOWN[]_config_args --libs`"
+     ifelse([$2], , ,[
+        DOWN[]_config_major_version=`$UP[]_CONFIG $DOWN[]_config_args \
+         --version | sed 's/[[^0-9]]*\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
+        DOWN[]_config_minor_version=`$UP[]_CONFIG $DOWN[]_config_args \
+         --version | sed 's/[[^0-9]]*\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
+        DOWN[]_config_micro_version=`$UP[]_CONFIG $DOWN[]_config_args \
+         --version | sed 's/[[^0-9]]*\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
+        DOWN[]_wanted_major_version="regexp($2, [\<\([0-9]*\)], [\1])"
+        DOWN[]_wanted_minor_version="regexp($2, [\<\([0-9]*\)\.\([0-9]*\)], [\2])"
+        DOWN[]_wanted_micro_version="regexp($2, [\<\([0-9]*\).\([0-9]*\).\([0-9]*\)], [\3])"
+
+        # Compare wanted version to what config script returned.
+        # If I knew what library was being run, i'd probably also compile
+        # a test program at this point (which also extracted and tested
+        # the version in some library-specific way)
+        if test "$DOWN[]_config_major_version" -lt \
+                        "$DOWN[]_wanted_major_version" \
+          -o \( "$DOWN[]_config_major_version" -eq \
+                        "$DOWN[]_wanted_major_version" \
+            -a "$DOWN[]_config_minor_version" -lt \
+                        "$DOWN[]_wanted_minor_version" \) \
+          -o \( "$DOWN[]_config_major_version" -eq \
+                        "$DOWN[]_wanted_major_version" \
+            -a "$DOWN[]_config_minor_version" -eq \
+                        "$DOWN[]_wanted_minor_version" \
+            -a "$DOWN[]_config_micro_version" -lt \
+                        "$DOWN[]_wanted_micro_version" \) ; then
+          # older version found
+          no_[]DOWN=yes
+          echo -n "*** An old version of $1 "
+          echo -n "($DOWN[]_config_major_version"
+          echo -n ".$DOWN[]_config_minor_version"
+          echo    ".$DOWN[]_config_micro_version) was found."
+          echo -n "*** You need a version of $1 newer than "
+          echo -n "$DOWN[]_wanted_major_version"
+          echo -n ".$DOWN[]_wanted_minor_version"
+          echo    ".$DOWN[]_wanted_micro_version."
+          echo "***"
+          echo "*** If you have already installed a sufficiently new version, this error"
+          echo "*** probably means that the wrong copy of the DOWN-config shell script is"
+          echo "*** being found. The easiest way to fix this is to remove the old version"
+          echo "*** of $1, but you can also set the UP[]_CONFIG environment to point to the"
+          echo "*** correct copy of DOWN-config. (In this case, you will have to"
+          echo "*** modify your LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf"
+          echo "*** so that the correct libraries are found at run-time)"
+        fi
+     ])
+  fi
+  if test "x$no_[]DOWN" = x ; then
+     AC_MSG_RESULT(yes)
+     ifelse([$3], , :, [$3])
+  else
+     AC_MSG_RESULT(no)
+     if test "$UP[]_CONFIG" = "no" ; then
+       echo "*** The DOWN-config script installed by $1 could not be found"
+       echo "*** If $1 was installed in PREFIX, make sure PREFIX/bin is in"
+       echo "*** your path, or set the UP[]_CONFIG environment variable to the"
+       echo "*** full path to DOWN-config."
+     fi
+     UP[]_CFLAGS=""
+     UP[]_LIBS=""
+     ifelse([$4], , :, [$4])
+  fi
+  AC_SUBST(UP[]_CFLAGS)
+  AC_SUBST(UP[]_LIBS)
+
+  popdef([UP])
+  popdef([DOWN])
+])
+