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-rw-r--r--stdlib/Makefile1
-rw-r--r--stdlib/isomac.c5
2 files changed, 3 insertions, 3 deletions
diff --git a/stdlib/Makefile b/stdlib/Makefile
index da6e0764fc..76b7ca7faa 100644
--- a/stdlib/Makefile
+++ b/stdlib/Makefile
@@ -146,7 +146,6 @@ LDFLAGS-tst-putenv = $(no-as-needed)
 $(objpfx)tst-putenvmod.so: $(objpfx)tst-putenvmod.os $(link-libc-deps)
 	$(build-module)
 libof-tst-putenvmod = extramodules
-CFLAGS-tst-putenvmod.c = -DNOT_IN_libc=1
 
 $(objpfx)bug-getcontext: $(libm)
 $(objpfx)tst-strtod-round: $(libm)
diff --git a/stdlib/isomac.c b/stdlib/isomac.c
index 13accb566c..6fc97cd4f8 100644
--- a/stdlib/isomac.c
+++ b/stdlib/isomac.c
@@ -176,7 +176,8 @@ static char *macros[] =
 /* Format string to build command to invoke compiler.  */
 static const char fmt[] = "\
 echo \"#include <%s>\" |\
-%s -E -dM -ansi -pedantic %s -D_LIBC -D_ISOMAC -DNOT_IN_libc -I. \
+%s -E -dM -ansi -pedantic %s -D_LIBC -D_ISOMAC \
+-DIN_MODULE=MODULE_extramodules -I. \
 -isystem `%s --print-prog-name=include` - 2> /dev/null > %s";
 
 
@@ -305,7 +306,7 @@ get_null_defines (void)
 	;
       result[result_len] = xstrndup (start, end - start);
 
-      if (strcmp (result[result_len], "NOT_IN_libc") != 0)
+      if (strcmp (result[result_len], "IN_MODULE") != 0)
 	{
 	  if (first)
 	    {