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-rw-r--r--libphobos/m4/druntime/libraries.m42
1 files changed, 1 insertions, 1 deletions
diff --git a/libphobos/m4/druntime/libraries.m4 b/libphobos/m4/druntime/libraries.m4
index 6e81fd9..a7aab4d 100644
--- a/libphobos/m4/druntime/libraries.m4
+++ b/libphobos/m4/druntime/libraries.m4
@@ -178,7 +178,7 @@ AC_DEFUN([DRUNTIME_LIBRARIES_BACKTRACE],
LIBBACKTRACE=../../libbacktrace/libbacktrace.la
gdc_save_CPPFLAGS=$CPPFLAGS
- CPPFLAGS+=" -I../libbacktrace "
+ CPPFLAGS="$CPPFLAGS -I../libbacktrace "
AC_CHECK_HEADER(backtrace-supported.h, have_libbacktrace_h=true,
have_libbacktrace_h=false)