do not hardcode libdir
see https://bugs.gentoo.org/979297 
--- a/base/aiksaurus-1.0.pc.in
+++ b/base/aiksaurus-1.0.pc.in
@@ -1,6 +1,6 @@
 prefix=@prefix@
 exec_prefix=${prefix}
-libdir=${exec_prefix}/lib
+libdir=@libdir@
 includedir=${prefix}/include
 
 Name: Aiksaurus
--- a/gtk/gaiksaurus-1.0.pc.in
+++ b/gtk/gaiksaurus-1.0.pc.in
@@ -1,6 +1,6 @@
 prefix=@prefix@
 exec_prefix=${prefix}
-libdir=${exec_prefix}/lib
+libdir=@libdir@
 includedir=${prefix}/include
 
 Name: AiksaurusGTK