--- gentoo/dev-lang/lua/files/lua.pc	2012-03-04 23:58:29.000000000 +0100
+++ local/dev-lang/lua/files/lua-r1.pc	2015-02-22 14:48:38.220620222 +0100
@@ -10,7 +10,7 @@
 # grep '^INSTALL_.*=' ../Makefile | sed 's/INSTALL_TOP/prefix/'
 prefix= /usr
 INSTALL_BIN= ${prefix}/bin
-INSTALL_INC= ${prefix}/include
+INSTALL_INC= ${prefix}/include/lua${V}
 INSTALL_LIB= ${prefix}/,lib,
 INSTALL_MAN= ${prefix}/man/man1
 INSTALL_LMOD= ${prefix}/share/lua/${V}
@@ -19,7 +19,7 @@
 # canonical vars
 exec_prefix=${prefix}
 libdir=${exec_prefix}/,lib,
-includedir=${prefix}/include
+includedir=${prefix}/include/lua${V}
 
 Name: Lua
 Description: An Extensible Extension Language