Create and install pkg-config file with cmake

build/cmake/lib/CMakeLists.txt

@@ -130,8 +130,20 @@ IF (ZSTD_BUILD_STATIC)
 ENDIF (ZSTD_BUILD_STATIC)
 
 IF (UNIX)
+    # pkg-config
+    SET(PREFIX "${CMAKE_INSTALL_PREFIX}")
+    SET(LIBDIR "${CMAKE_INSTALL_PREFIX}/lib")
+    SET(INCLUDEDIR "${CMAKE_INSTALL_PREFIX}/include")
+    SET(VERSION "${LIBVER_MAJOR}.${LIBVER_MINOR}.${LIBVER_RELEASE}")
+    ADD_CUSTOM_TARGET(libzstd.pc ALL
+            ${CMAKE_COMMAND} -DIN="${LIBRARY_DIR}/libzstd.pc.in" -DOUT="libzstd.pc"
+            -DPREFIX="${PREFIX}" -DLIBDIR="${LIBDIR}" -DINCLUDEDIR="${INCLUDEDIR}" -DVERSION="${VERSION}"
+            -P "${CMAKE_SOURCE_DIR}/lib/pkgconfig.cmake"
+            COMMENT "Creating pkg-config file")
+
     # install target
     INSTALL(FILES ${LIBRARY_DIR}/zstd.h ${LIBRARY_DIR}/deprecated/zbuff.h ${LIBRARY_DIR}/dictBuilder/zdict.h DESTINATION "include")
+    INSTALL(FILES "${CMAKE_CURRENT_BINARY_DIR}/libzstd.pc" DESTINATION "share/pkgconfig")
     INSTALL(TARGETS libzstd_shared LIBRARY DESTINATION "lib")
     IF (ZSTD_BUILD_STATIC)
         INSTALL(TARGETS libzstd_static ARCHIVE DESTINATION "lib")

build/cmake/lib/pkgconfig.cmake

@@ -0,0 +1 @@
+CONFIGURE_FILE("${IN}" "${OUT}" @ONLY)