check and try to detect Qt tools; refs #40

configure.in

@@ -128,9 +128,21 @@ PKG_CHECK_MODULES([QT], [Qt5Core Qt5Gui Qt5Widgets Qt5Network],
         have_qt=1],
        [have_qt=0])])
 AM_CONDITIONAL(HAVE_QT, test "$have_qt" = "1")
-if test "$have_qt" = "1"; then
-  test -n "$UIC" -a -n "$MOC" -a -n "$RCC" -a -n "$LUPDATE" -a -n "$LRELEASE"
-  which "$UIC" "$MOC" "$RCC" "$LUPDATE" "$LRELEASE"
+if test "$have_qt" = "1" \
+   && ! which "$UIC" "$MOC" "$RCC" "$LUPDATE" "$LRELEASE"; then
+     if test -n "$MOC" \
+        && which "${UIC:=${MOC/moc/uic}}" "${RCC:=${MOC/moc/rcc}}" \
+                 "${LUPDATE:=${MOC/moc/lupdate}}" \
+                 "${LRELEASE:=${MOC/moc/lrelease}}"; then
+        AC_MSG_NOTICE([Detected: "$UIC" "$MOC" "$RCC" "$LUPDATE" "$LRELEASE"])
+     else
+        AC_MSG_ERROR([Missing QT Programs.
+  - Needed: moc rcc lupdate lrelease
+  - Found: $UIC $MOC $RCC $LUPDATE $LRELEASE
+You can specify the missing programs by passing one of the variables:
+    \$UIC \$MOC \$RCC \$LUPDATE \$LRELEASE
+Often it is sufficient to specify MOC=/path/to/moc ./configure)])
+     fi
 fi
 AC_SUBST(UIC)
 AC_SUBST(MOC)