fix build on mac, fix wrong AX_PKG_CHECK

ChangeLog

@@ -1,3 +1,13 @@
+2015-05-12 13:32  marc
+
+	* ax_check_qt.m4, ax_init_standard_project.m4, configure.ac:
+	  QtNetwork depends on QT >= 5.2
+
+2015-05-12 08:57  marc
+
+	* ChangeLog, ax_init_standard_project.m4, bootstrap.sh,
+	  src/makefile.am: fixed build
+
 2015-05-11 13:45  marc
 
 	* src/makefile.am: don't miss build of cert2text

ax_init_standard_project.m4

@@ -68,7 +68,7 @@ dnl refers to ${prefix}.  Thus we have to use `eval' twice.
 #     $3 = filename of makefile.in
 AC_DEFUN([AX_ADD_MAKEFILE_TARGET_DEP], [
   sh_add_makefile_target_dep() {
-    sed -i ':a;/^'${1}':.*\\$/{N;s/\\\n//;ta};s/^'${1}':.*$/& '${2}'/' "${srcdir}/${3}"
+    sed -i -e ':a;/^'${1}':.*\\$/{N;s/\\\n//;ta};s/^'${1}':.*$/& '${2}'/' "${srcdir}/${3}"
     if ! egrep -q "${1}:.* ${2}" "${srcdir}/${3}"; then
         echo "${1}: ${2}" >> "${srcdir}/${3}"
     fi
@@ -442,8 +442,6 @@ AC_DEFUN([AX_PKG_REQUIRE], [
       if test ${$1_found} -eq 0; then
         AC_MSG_ERROR([Required package $2 or $4 for feature $1 not installed])
       fi
-    else
-      AC_MSG_ERROR([Required package $2 for feature $1 not installed])
     fi
   ])
   AC_SUBST(AM_CPPFLAGS)
@@ -457,6 +455,8 @@ AC_DEFUN([AX_PKG_REQUIRE], [
       AC_MSG_ERROR([Required header $3 for feature $1 not found])
     ])
     CPPFLAGS=${old_CPPFLAGS}
+  elif test ${$1_found} -eq 0; then
+    AC_MSG_ERROR([Required package $2 for feature $1 not installed])
   fi
 ])