The way the configure script determines the version of libwmf is by temporarily
making dots separator characters, but since the file name of the program which
returns the version contains dots in Guix (the version in the store entry name),
doing it this way will always fail.

This is a simple guix-specific fix for the problem.

--- a/configure	2010-06-13 23:17:37.000000000 +0200
+++ b/configure	2014-09-08 17:31:52.102371800 +0200
@@ -21140,13 +21140,11 @@
 $as_echo "$as_me: WARNING: wmf plugin: program libwmf-config not found in path" >&2;}
 		fi
 	else
-		IFS_old="$IFS"
-		IFS='.'
-		set -- `$libwmfconfig --version`
-		libwmf_major_found="${1}"
-		libwmf_minor_found="${2}"
-		libwmf_micro_found="${3}"
-		IFS="$IFS_old"
+		libwmf_fullver_found=`$libwmfconfig --version`
+		libwmf_major_found=$(echo $libwmf_fullver_found |  cut -d . -f 1)
+		libwmf_minor_found=$(echo $libwmf_fullver_found |  cut -d . -f 2)
+		libwmf_micro_found=$(echo $libwmf_fullver_found |  cut -d . -f 3)
+
 		if test "$libwmf_major_found" -gt "$libwmf_major_req"; then
 			wmf_deps="yes"
 		elif test "$libwmf_major_found" -eq "$libwmf_major_req" &&
