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-rw-r--r--config.h.in3
1 files changed, 2 insertions, 1 deletions
diff --git a/config.h.in b/config.h.in
index 3b938f8013..81704a1ff6 100644
--- a/config.h.in
+++ b/config.h.in
@@ -1,4 +1,5 @@
-#if !defined __ASSEMBLER__ && !defined _ISOMAC && !defined __OPTIMIZE__
+#if !defined IS_IN_build && !defined __ASSEMBLER__ && !defined _ISOMAC \
+    && !defined __OPTIMIZE__
 # error "glibc cannot be compiled without optimization"
 #endif