do not (mis-)use the config file generator for non-autobuild stuff

"Similarly, you should not rely on AC_CONFIG_FILES to replace bindir
and friends in your shell scripts and other files; instead, let make
manage their replacement."

http://www.gnu.org/software/autoconf/manual/autoconf.html#Makefile-Substitutions
diff --git a/configure.ac b/configure.ac
index 6569a6b..9c84a04 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,6 +25,9 @@
 AC_PROG_GCC_TRADITIONAL
 AC_C_BIGENDIAN
 
+AC_PROG_SED
+AC_PROG_MKDIR_P
+
 required_private_libs=""
 
 AC_ARG_WITH([rootprefix],
@@ -122,7 +125,6 @@
 AC_CONFIG_HEADERS(config.h)
 AC_CONFIG_FILES([
 	Makefile
-	libkmod/libkmod.pc
 ])
 
 AC_OUTPUT