v4l2-apps: fix qv4l2 build

From: Hans Verkuil <hverkuil@xs4all.nl>

Don't build qv4l2 if qt3 is not installed.

Priority: normal

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

diff --git a/utils/Makefile b/utils/Makefile
index 7edfbfc..980002d 100644 (file)
--- a/utils/Makefile
+++ b/utils/Makefile
@@ -46,9 +46,14 @@ clean::
        rm -f v4l2-chipids.cpp
        rm -rf keycodes parse.h keytable
 
+# Test whether qmake is installed, and whether it is for qt3.
 qv4l2:
-       -if [ ! -f qv4l2/Makefile ]; then (cd qv4l2; qmake); fi
-       $(MAKE) -C qv4l2
+       @-if which qmake >/dev/null 2>&1; then \
+               if qmake --version 2>&1 | grep '3\.[0-9][0-9]*\.[0-9][0-9]*' >/dev/null; then \
+                       if [ ! -f qv4l2/Makefile ]; then (cd qv4l2; qmake); fi; \
+                       $(MAKE) -C qv4l2; \
+               fi \
+       fi
 
 v4l2-dbg: v4l2-dbg.o v4l2-chipids.o
        $(CXX) $^ -o $@