allow configure to select Qt version * Makefile.am (AM_FFLAGS): Include FPICFLAG in definition. (AM_CFLAGS): Include CPICFLAG in definition. (AM_CXXFLAGS): Include CXXPICFLAG in definition. * libgui/module.mk: Use MOCFLAGS, UICFLAGS, RCCFLAGS, and LRELEASEFLAGS in MOC, UIC, RCC, and LRELEASE commands. * acinclude.m4: Add CXXPICFLAG to CXXFLAGS in Qt tests. (OCTAVE_CHECK_QSCINTILLA_VERSION): Rename from OCTAVE_CHECK_VERSION_2_6_0. (OCTAVE_CHECK_QT_VERSION, OCTAVE_CHECK_QT): New macros extracted from configure.ac. * configure.ac: Move checks for shared vs. static libraries earlier in file. Allow checking for multiple versions of Qt libraries. Report MOC, UIC, RCC, and LRELEASE in summary.

--- a/Makefile.am	Mon Aug 08 19:22:29 2016 -0400
+++ b/Makefile.am	Tue Aug 09 14:41:52 2016 -0400
@@ -38,11 +38,11 @@
 
 # Fortran compiler flags.
 
-AM_FFLAGS = @FFLAGS@
+AM_FFLAGS = ${FPICFLAG} @FFLAGS@
 
 # C compiler flags.
 
-AM_CFLAGS = ${XTRA_CFLAGS}
+AM_CFLAGS = ${CPICFLAG} ${XTRA_CFLAGS}
 
 # ifeq (${INCLUDE_DEPS},no)
 #   omit_deps = true;
@@ -50,7 +50,7 @@
 
 # C++ compiler flags.
 
-AM_CXXFLAGS = ${XTRA_CXXFLAGS}
+AM_CXXFLAGS = ${CXXPICFLAG} ${XTRA_CXXFLAGS}
 
 FFTW_XCPPFLAGS = @FFTW_XCPPFLAGS@
 FFTW_XLDFLAGS = @FFTW_XLDFLAGS@