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-rw-r--r--src/m4/bitcoin_subdir_to_include.m46
1 files changed, 4 insertions, 2 deletions
diff --git a/src/m4/bitcoin_subdir_to_include.m4 b/src/m4/bitcoin_subdir_to_include.m4
index 9b37a75ef0..66f106c7d4 100644
--- a/src/m4/bitcoin_subdir_to_include.m4
+++ b/src/m4/bitcoin_subdir_to_include.m4
@@ -5,8 +5,10 @@ AC_DEFUN([BITCOIN_SUBDIR_TO_INCLUDE],[
AC_MSG_RESULT([default])
else
echo "#include <$2$3.h>" >conftest.cpp
- newinclpath=`${CXXCPP} -M conftest.cpp 2>/dev/null | [ tr -d '\\n\\r\\\\' | sed -e 's/^.*[[:space:]:]\(\/[^[:space:]]*\)]$3[\.h[[:space:]].*$/\1/' -e t -e d`]
+ newinclpath=`${CXXCPP} ${CPPFLAGS} -M conftest.cpp 2>/dev/null | [ tr -d '\\n\\r\\\\' | sed -e 's/^.*[[:space:]:]\(\/[^[:space:]]*\)]$3[\.h[[:space:]].*$/\1/' -e t -e d`]
AC_MSG_RESULT([${newinclpath}])
- eval "$1=\"\$$1\"' -I${newinclpath}'"
+ if test "x${newinclpath}" != "x"; then
+ eval "$1=\"\$$1\"' -I${newinclpath}'"
+ fi
fi
])