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-rw-r--r--src/configure.ac2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/configure.ac b/src/configure.ac
index a5beb834dc..fc346dc811 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -314,6 +314,8 @@ fi
dnl Mac OS X 10.9+ no longer include AvailabilityMacros.h in Carbon
dnl so we need to include it to have access to version macros.
AC_CHECK_HEADERS(AvailabilityMacros.h)
+# 10.5 and earlier lack dispatch
+AC_CHECK_HEADERS(dispatch/dispatch.h)
AC_SUBST(OS_EXTRA_SRC)
AC_SUBST(OS_EXTRA_OBJ)