diff --git a/F2CLIBS/libf2c/CMakeLists.txt b/F2CLIBS/libf2c/CMakeLists.txt
index 2bdbd05..ca1473f 100644
--- a/F2CLIBS/libf2c/CMakeLists.txt
+++ b/F2CLIBS/libf2c/CMakeLists.txt
@@ -59,4 +59,7 @@ endif()
 include_directories(${CLAPACK_SOURCE_DIR}/F2CLIBS/libf2c)
 include_directories(${CLAPACK_BINARY_DIR}/F2CLIBS/libf2c)
 add_library(f2c STATIC ${OFILES} ${CMAKE_CURRENT_BINARY_DIR}/arith.h)
+if(UNIX)
+  target_link_libraries(f2c m)
+endif()
 set_property(TARGET f2c PROPERTY PREFIX lib)