Gflags: include path fix (#1652)

dev-cpp/gflags/gflags-2.2.1.recipe

@@ -6,7 +6,7 @@ which they are used."
 HOMEPAGE="https://gflags.github.io/gflags/"
 COPYRIGHT="2006 Google Inc."
 LICENSE="BSD (3-clause)"
-REVISION="1"
+REVISION="2"
 SOURCE_URI="https://github.com/gflags/gflags/archive/v$portVersion.tar.gz"
 CHECKSUM_SHA256="ae27cdbcd6a2f935baa78e4f21f675649271634c092b1be01469440495609d0e"
 
@@ -39,6 +39,7 @@ BUILD_PREREQUIRES="
 	cmd:cmake
 	cmd:gcc$secondaryArchSuffix
 	cmd:make
+	cmd:sed
 	"
 
 BUILD()
@@ -67,6 +68,9 @@ INSTALL()
 	prepareInstalledDevelLibs libgflags libgflags_nothreads
 	fixPkgconfig
 
+	sed -i 's,\/include,/'${relativeIncludeDir}',g' \
+		$libDir/cmake/gflags/gflags-config.cmake
+
 	packageEntries devel \
 		$developDir \
 		$libDir/cmake