Add autotools/pkgconfig magic
diff --git a/libasn1c.pc.in b/libasn1c.pc.in
new file mode 100644
index 0000000..ff9dde9
--- /dev/null
+++ b/libasn1c.pc.in
@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: asn1c runtime library
+Description: C Utility Library
+Version: @VERSION@
+Libs: -L${libdir} -lasn1c
+Cflags: -I${includedir}/
+