liblame check from autostars

Original commit message from CVS:
liblame check from autostars

m4/as-liblame.m4

@@ -0,0 +1,50 @@
+# CFLAGS and library paths for LIBLAME
+# taken from Autostar Sandbox, http://autostars.sourceforge.net/
+# inspired by xmms.m4
+
+dnl Usage:
+dnl AM_PATH_LIBLAME([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
+dnl FIXME: version checking does not work currently
+dnl
+dnl Example:
+dnl AM_PATH_LIBLAME(3.89, , AC_MSG_ERROR([*** LIBLAME >= 3.89 not installed)) 
+dnl
+dnl Defines LIBLAME_LIBS
+dnl FIXME: should define LIBLAME_VERSION
+dnl
+
+AC_DEFUN(AM_PATH_LIBLAME,
+[
+  dnl check for the library
+  AC_CHECK_LIB(mp3lame, lame_init, HAVE_LIBLAME=yes, HAVE_LIBLAME=no, -lm)
+  dnl check if lame.h is available in the standard location or not
+  HAVE_LAME_H_STD=no
+  AC_CHECK_HEADER(lame.h, HAVE_LAME_H_STD=no, :)
+  AC_CHECK_HEADER(lame/lame.h, HAVE_LAME_H_STD=yes, :)
+  AC_MSG_CHECKING(for lame.h in right location)
+  if test "x$HAVE_LAME_H_STD" = "xyes"; then
+    AC_MSG_RESULT(yes)
+  else
+    AC_MSG_RESULT(no)
+    HAVE_LIBLAME=no
+    if test "x$HAVE_LAME_H_STD"="xno"; then
+      AC_MSG_WARN(lame.h found in include dir,)
+      AC_MSG_WARN( while it should be in it's own lame/ dir !)
+    fi
+ fi
+
+  dnl now do the actual "do we have it ?" test
+  if test "x$HAVE_LIBLAME" = "xyes"; then
+    LIBLAME_LIBS="-lmp3lame -lm"
+    dnl execute what we have to because it's found
+    ifelse([$2], , :, [$2])
+  else
+    LIBLAME_LIBS=""
+    dnl execute what we have to because it's not found
+    ifelse([$3], , :, [$3])
+  fi
+
+  dnl make variables available
+  AC_SUBST(LIBLAME_LIBS)
+  AC_SUBST(HAVE_LIBLAME)
+])