-CPP = /opt/xmingw/bin/i386-mingw32msvc-cpp
-CC = /opt/xmingw/bin/i386-mingw32msvc-gcc
-LD = /opt/xmingw/bin/i386-mingw32msvc-ld
-NM = /opt/xmingw/bin/i386-mingw32msvc-nm
+CPP = cpp
+CC = gcc
+LD = ld
+NM = nm
+
+ifneq ($(findstring cygwin,$(shell $(CC) -dumpmachine)),)
+OS_LINK_FLAGS := $(OS_LINK_FLAGS) -Wl,-mno-cygwin
+OS_LIBS := $(OS_LIBS) -mno-cygwin
+CFLAGS := $(CFLAGS) -mno-cygwin
+endif
+
+# Nothing to do for after-grovel-headers.
+.PHONY: after-grovel-headers
+after-grovel-headers: