# directly via ASDF from a non-C-aware module which has these tricky
# ones as dependencies.
-UNAME:=$(shell uname -m)
+UNAME:=$(shell uname -s)
+
+ifeq (SunOS,$(UNAME))
+ EXTRA_CFLAGS=-D_XOPEN_SOURCE=500 -D__EXTENSIONS__
+endif
export CC SBCL EXTRA_CFLAGS EXTRA_LDFLAGS