Consistency: Use @PACKAGE@ in libincludedir path, like in lib/Makefile.am.
No effective change AFAICT.

--HG--
branch : HEAD
diff --git a/libzip.pc.in b/libzip.pc.in
index f1301be..7ab8986 100644
--- a/libzip.pc.in
+++ b/libzip.pc.in
@@ -2,7 +2,7 @@
 exec_prefix=@exec_prefix@
 libdir=@libdir@
 includedir=@includedir@
-libincludedir=@libdir@/libzip/include
+libincludedir=@libdir@/@PACKAGE@/include
 
 zipcmp=@prefix@/bin/zipcmp