use ASM_API variable, bug 4415
diff --git a/configs/freebsd-dri-amd64 b/configs/freebsd-dri-amd64
index ffddfd8..39341b9 100644
--- a/configs/freebsd-dri-amd64
+++ b/configs/freebsd-dri-amd64
@@ -6,4 +6,5 @@
 CONFIG_NAME = freebsd-dri-x86-64
 
 ASM_FLAGS = -DUSE_X86_64_ASM
-ASM_SOURCES = $(X86-64_SOURCES) $(X86-64_API)
+ASM_SOURCES = $(X86-64_SOURCES)
+ASM_API = $(X86-64_API)