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-rw-r--r--autoconf/configure.ac4
1 files changed, 2 insertions, 2 deletions
diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index f9c365cb1c..45f2fe485e 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -61,8 +61,8 @@ fi
dnl Default to empty (i.e. assigning the null string to) CFLAGS and CXXFLAGS,
dnl instead of the autoconf default (for example, '-g -O2' for CC=gcc).
-${CFLAGS=}
-${CXXFLAGS=}
+: ${CFLAGS=}
+: ${CXXFLAGS=}
dnl We need to check for the compiler up here to avoid anything else
dnl starting with a different one.