···125125makeCmakeFindLibs(){
126126 isystem_seen=
127127 iframework_seen=
128128- for flag in $NIX_CFLAGS_COMPILE $NIX_LDFLAGS; do
128128+ for flag in ${NIX_CFLAGS_COMPILE-} ${NIX_LDFLAGS-}; do
129129 if test -n "$isystem_seen" && test -d "$flag"; then
130130 isystem_seen=
131131 export CMAKE_INCLUDE_PATH="${CMAKE_INCLUDE_PATH-}${CMAKE_INCLUDE_PATH:+:}${flag}"