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diff --git a/unistd.in.h b/unistd.in.h
index b82be83..9df3f13 100644
--- a/unistd.in.h
+++ b/unistd.in.h
@@ -125,7 +125,11 @@
/* Get getopt(), optarg, optind, opterr, optopt.
But avoid namespace pollution on glibc systems. */
-#if @GNULIB_UNISTD_H_GETOPT@ && !defined __GLIBC__ && !defined _GL_SYSTEM_GETOPT
+/* Also, don't include <getopt.h> inside libgettextpo, because we use
+ the getopt module only in gettext-tools/gnulib-lib/, not in
+ gettext-tools/libgettextpo/, but there is only a single
+ GNULIB_UNISTD_H_GETOPT variable for both. */
+#if @GNULIB_UNISTD_H_GETOPT@ && !defined GTPO_CONFIG_H && !defined __GLIBC__ && !defined _GL_SYSTEM_GETOPT
# define __need_getopt
# include <getopt.h>
#endif
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