diff --git a/src/ansi-c/CMakeLists.txt b/src/ansi-c/CMakeLists.txt
index d15eb2b4371..79588b05139 100644
--- a/src/ansi-c/CMakeLists.txt
+++ b/src/ansi-c/CMakeLists.txt
@@ -28,6 +28,12 @@ if(MINGW)
         ${CMAKE_CURRENT_SOURCE_DIR}/library/err.c
         ${CMAKE_CURRENT_SOURCE_DIR}/library/threads.c
     )
+elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
+    set(platform_unavail
+        ${CMAKE_CURRENT_SOURCE_DIR}/library/fenv.c
+        ${CMAKE_CURRENT_SOURCE_DIR}/library/java.io.c
+        ${CMAKE_CURRENT_SOURCE_DIR}/library/threads.c
+    )
 else()
     set(platform_unavail
         ${CMAKE_CURRENT_SOURCE_DIR}/library/java.io.c
diff --git a/src/ansi-c/Makefile b/src/ansi-c/Makefile
index e3357149fc4..20ca043e900 100644
--- a/src/ansi-c/Makefile
+++ b/src/ansi-c/Makefile
@@ -106,8 +106,10 @@ library/converter$(EXEEXT): library/converter.cpp
 file_converter$(EXEEXT): file_converter.cpp
 	$(LINKNATIVE)
 
-ifeq ($(BUILD_ENV),MinGW)
+ifeq ($(BUILD_ENV_),MinGW)
   platform_unavail = library/java.io.c library/err.c library/threads.c
+else ifeq ($(BUILD_ENV_),FreeBSD)
+  platform_unavail = library/fenv.c library/java.io.c library/threads.c
 else
   platform_unavail = library/java.io.c library/threads.c
 endif