Makefile in xlsxwriter-0.1.0

- old
+ new

@@ -30,14 +30,9 @@
 FPIC =
 CC = gcc
 CFLAGS += -DUSE_FILE32API
 endif
 
-# Fix for modified zconf.h on Gentoo.
-ifneq (,$(findstring gentoo, $(UNAME)))
-CFLAGS += -DOF=_Z_OF
-endif
-
 all: ioapi.o zip.o  ioapi.so zip.so
 
 %.o  : %.c
 	$(Q)$(CC)         -c $(CFLAGS) $<
 