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-rw-r--r--Makefile.am2
1 files changed, 1 insertions, 1 deletions
diff --git a/Makefile.am b/Makefile.am
index 6d1bceb5..b56e9280 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -13,7 +13,7 @@ dist-hook:
grep "^#found_debug=" configure
# Preprocessor flags.
-AM_CPPFLAGS = @XOPEN_DEFINES@ -DTMUX_CONF="\"$(sysconfdir)/tmux.conf\""
+AM_CPPFLAGS += @XOPEN_DEFINES@ -DTMUX_CONF="\"$(sysconfdir)/tmux.conf\""
# glibc as usual does things ass-backwards and hides useful things by default,
# so everyone has to add this.