diff --git a/CMakeLists.txt b/CMakeLists.txt
index ec852a1..38f893e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,12 +21,20 @@ else()
     message(FATAL_ERROR "Error: cannot locate fontforge.h")
 endif()
 
-find_library(FF_LIB libfontforge.so)
+if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+    set(FF_LIB_EXT ".so")
+elseif(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+    set(FF_LIB_EXT ".dylib")
+else()
+    message("Set FF_LIB_EXT for your platform!")
+endif()
+
+find_library(FF_LIB libfontforge${FF_LIB_EXT})
 if(FF_LIB)
-    message("Found libfontforge.so: ${FF_LIB}")
+    message("Found libfontforge${FF_LIB_EXT}: ${FF_LIB}")
     set(FONTFORGE_LIBRARIES ${FF_LIB})
 else()
-    message(FATAL_ERROR "Error: cannot locate libfontforge.so")
+    message(FATAL_ERROR "Error: cannot locate libfontforge${FF_LIB_EXT}")
 endif()
 
 message("Looking for libraries of python, which is required by fontforge, if you can link fontforge without python, you may disable this")