snappy: add a pkgconfig file.

app-arch/snappy/snappy-1.1.7.recipe

@@ -8,7 +8,7 @@ for most inputs, but the resulting compressed files are anywhere from 20% to \
 HOMEPAGE="https://google.github.io/snappy/"
 COPYRIGHT="2005-2017 Google Inc"
 LICENSE="BSD (3-clause)"
-REVISION="1"
+REVISION="2"
 SOURCE_URI="https://github.com/google/snappy/archive/$portVersion.tar.gz"
 CHECKSUM_SHA256="3dfa02e873ff51a11ee02b9ca391807f0c8ea0529a4924afa645fbf97163f9d4"
 
@@ -54,6 +54,21 @@ INSTALL()
 	make install
 
 	prepareInstalledDevelLib libsnappy
+
+	mkdir -p $developLibDir/pkgconfig
+	cat > $developLibDir/pkgconfig/snappy.pc << EOF
+prefix=${prefix}
+exec_prefix=${prefix}
+libdir=${libDir}
+includedir=${includeDir}
+
+Name: snappy
+Description: A fast compression/decompression library
+Version: $portVersion
+Libs: -L${developLibDir} -lsnappy
+Cflags: -I${includedir}
+EOF
+
 	packageEntries devel \
 		$developDir \
 		$libDir/cmake