Enabled pkg-config file generation on MinGW.

Fixes #220.

CMakeLists.txt

@@ -154,6 +154,9 @@ endif()
 # Use Win32 for window creation
 #--------------------------------------------------------------------
 if (_GLFW_WIN32)
+
+    set(GLFW_PKG_LIBS "${GLFW_PKG_LIBS} -lgdi32 -lwinmm")
+
     # The DLL links against winmm; the static library loads it
     # That way, both code paths receive testing
     if (BUILD_SHARED_LIBS)
@@ -180,8 +183,12 @@ endif()
 # Use WGL for context creation
 #--------------------------------------------------------------------
 if (_GLFW_WGL)
+
+    set(GLFW_PKG_LIBS "${GLFW_PKG_LIBS} -lopengl32")
+
     list(APPEND glfw_INCLUDE_DIRS ${OPENGL_INCLUDE_DIR})
     list(APPEND glfw_LIBRARIES ${OPENGL_gl_LIBRARY})
+
 endif()
 
 #--------------------------------------------------------------------
@@ -308,9 +315,7 @@ if (_GLFW_EGL)
     list(APPEND glfw_INCLUDE_DIRS ${EGL_INCLUDE_DIR})
     list(APPEND glfw_LIBRARIES ${EGL_LIBRARY})
 
-    if (UNIX)
-        set(GLFW_PKG_DEPS "${GLFW_PKG_DEPS} egl")
-    endif()
+    set(GLFW_PKG_DEPS "${GLFW_PKG_DEPS} egl")
 
     if (_GLFW_USE_OPENGL)
         list(APPEND glfw_LIBRARIES ${OPENGL_gl_LIBRARY})
@@ -397,10 +402,8 @@ configure_file(${GLFW_SOURCE_DIR}/src/glfwConfig.cmake.in
 configure_file(${GLFW_SOURCE_DIR}/src/glfwConfigVersion.cmake.in
                ${GLFW_BINARY_DIR}/src/glfwConfigVersion.cmake @ONLY)
 
-if (UNIX)
-    configure_file(${GLFW_SOURCE_DIR}/src/glfw3.pc.in
-                   ${GLFW_BINARY_DIR}/src/glfw3.pc @ONLY)
-endif()
+configure_file(${GLFW_SOURCE_DIR}/src/glfw3.pc.in
+                ${GLFW_BINARY_DIR}/src/glfw3.pc @ONLY)
 
 #--------------------------------------------------------------------
 # Add subdirectories
@@ -431,11 +434,9 @@ if (GLFW_INSTALL)
                   ${GLFW_BINARY_DIR}/src/glfwConfigVersion.cmake
             DESTINATION lib${LIB_SUFFIX}/cmake/glfw)
 
-    if (UNIX)
-        install(EXPORT glfwTargets DESTINATION lib${LIB_SUFFIX}/cmake/glfw)
-        install(FILES ${GLFW_BINARY_DIR}/src/glfw3.pc
-                DESTINATION lib${LIB_SUFFIX}/pkgconfig)
-    endif()
+    install(EXPORT glfwTargets DESTINATION lib${LIB_SUFFIX}/cmake/glfw)
+    install(FILES ${GLFW_BINARY_DIR}/src/glfw3.pc
+            DESTINATION lib${LIB_SUFFIX}/pkgconfig)
 
     # Only generate this target if no higher-level project already has
     if (NOT TARGET uninstall)