games/ufoai: Fix build on -current.

Signed-off-by: B. Watson <yalhcru@gmail.com>

games/ufoai/ufoai.SlackBuild

@@ -15,6 +15,14 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+# 20170706 bkw:
+# - fix build on -current
+
+# 20151126 bkw:
+# - fix build on systems that have SDL2 but not SDL2_ttf
+# - add SDL2 environment variable
+# - move binaries to /usr/games
+
 # 20140826 bkw:
 # - took over maintenance
 # - update for 2.5
@@ -24,11 +32,6 @@
 # - allow building the radiant editor. I have no idea if it's working
 #   correctly, since I have no idea how to use it.
 
-# 20151126 bkw:
-# - fix build on systems that have SDL2 but not SDL2_ttf
-# - add SDL2 environment variable
-# - move binaries to /usr/games
-
 PRGNAM=ufoai
 VERSION=${VERSION:-2.5}
 BUILD=${BUILD:-2}
@@ -91,6 +94,9 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
  -exec chmod 644 {} \;
 
+# 20170706 bkw: fix build with gcc7
+echo 'CXXFLAGS += -Wno-narrowing' >> build/flags.mk
+
 [ "${SDL2:-no}" = "no" ] && EXTRAOPT="--disable-sdl2"
 
 CFLAGS="$SLKCFLAGS" \