on the way to compile

ax_check_qt.m4

@@ -62,16 +62,35 @@ AC_DEFUN([AX_CXX_QT_TOOLS], [
   AX_CXX_QT_TOOL(LRELEASE, lrelease)
 ])
 
-AC_DEFUN([AX_CXX_CHECK_QT], [
+AC_DEFUN([AX_CHECK_VALID_FLAG], [
+  AC_MSG_CHECKING([m4_default([$2], [for valid flag in "$1"])])
+  save_cxxflags="$CXXFLAGS"
+  newflag="no"
+  for test_flag in $1; do
+    CXXFLAGS+=" ${test_flag}"
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [
+      newflag="$test_flag"
+      AM_CXXFLAGS+=" ${test_flag}"
+      CXXFLAGS="$save_cxxflags"
+      break;
+    ])
+    CXXFLAGS="$save_cxxflags"
+  done
+  AC_SUBST(AM_CXXFLAGS)
+  AC_MSG_RESULT([$newflag])
+])
+
+AC_DEFUN([AX_CHECK_QT], [
   qt_modules="$2"
   AX_CXX_QT_TOOLS
   HAVE_$1=0
-  PKG_CHECK_MODULES([$1], [${qt_modules//Qt/Qt5}], [
+  PKG_PROG_PKG_CONFIG
+  PKG_CHECK_MODULES([$1]5, [${qt_modules//Qt/Qt5}], [
     HAVE_$1=1
     AC_DEFINE([HAVE_$1])
-    AM_CPPFLAGS+=" ${$1_CFLAGS}"
-    AM_CXXFLAGS+=" ${$1_CFLAGS}"
-    LIBS+=" ${$1_LIBS}"
+    AM_CPPFLAGS+=" ${[$1]5_CFLAGS}"
+    AM_CXXFLAGS+=" ${[$1]5_CFLAGS}"
+    LIBS+=" ${[$1]5_LIBS}"
   ], [
     PKG_CHECK_MODULES([$1], [${qt_modules}], [
       HAVE_$1=1
@@ -82,10 +101,13 @@ AC_DEFUN([AX_CXX_CHECK_QT], [
     ], [HAVE_$1=0])
   ])
   AM_CONDITIONAL(HAVE_$1, test $HAVE_$1 -eq 1)
+  AX_CHECK_VALID_FLAG([-fPIC -fPIE], [position independent code flag])
   AC_SUBST(AM_CPPFLAGS)
   AC_SUBST(AM_CXXFLAGS)
   AX_ADDITIONAL_QT_RULES_HACK='
-%_ui.hxx: %.ui
+#BUILT_SOURCES += $(patsubst %.ui, ui_%.hxx, $(filter %.ui, $(SOURCES))))
+#BUILT_SOURCES += $(patsubst %.hxx, moc_%.cxx, $(shell grep -l Q_OBJECT $(HEADERS)))1
+ui_%.hxx: %.ui
 	${UIC} -o [$][@] $<
 
 moc_%.cxx: %.hxx
@@ -95,3 +117,10 @@ qrc_%.cxx: %.qrc
 	${RCC} -o [$][@] $<'
   AC_SUBST(AX_ADDITIONAL_QT_RULES_HACK)
 ])
+
+AC_DEFUN([AX_REQUIRE_QT], [
+  AX_CHECK_QT([$1], [$2])
+  if ! test "$HAVE_$1" -eq 1; then
+     AC_MSG_ERROR([Required Qt modules not found: $2])
+  fi
+])