Use pkg-config for cfitsio

http://bugs.gentoo.org/show_bug.cgi?id=339460

--- configure.ac
+++ configure.ac
@@ -69,7 +69,7 @@
 ESOREX_FUNC_GETOPT
 
 # Check for CPL/CFITSIO presence and usability
-CPL_CHECK_CFITSIO
+PKG_CHECK_MODULES([CFITSIO], [cfitsio >= 3.09])
 #CPL_CHECK_CEXT
 CPL_CHECK_LIBS
 ESO_CHECK_EXTRA_LIBS
--- src/Makefile.am
+++ src/Makefile.am
@@ -33,7 +33,7 @@
 
 CPPFLAGS = -DCX_LOG_DOMAIN=\"EsoRex\"
 
-INCLUDES = $(CFITSIO_INCLUDES) $(CPL_INCLUDES) $(CX_INCLUDES) $(INCLTDL)
+INCLUDES = $(CFITSIO_CFLAGS) $(CPL_INCLUDES) $(CX_INCLUDES) $(INCLTDL)
 
 noinst_HEADERS = er_fileutils.h er_help.h er_main.h er_params.h \
 		er_paramutils.h er_plugin.h er_pluginlist.h \
@@ -51,8 +51,8 @@
 
 config_DATA =
 
-esorex_LDFLAGS = $(CPL_LDFLAGS) $(CFITSIO_LDFLAGS) $(LIBLTDL)
-esorex_LDADD = @GETOPT@ $(LIBCPLUI) $(LIBCPLDFS) $(LIBLTDL)
+esorex_LDFLAGS = $(CPL_LDFLAGS) $(LIBLTDL)
+esorex_LDADD = @GETOPT@ $(CFITSIO_LIBS) $(LIBCPLUI) $(LIBCPLDFS) $(LIBLTDL)
 esorex_DEPENDENCIES = @GETOPT@ $(LIBLTDL)
 
 if PURIFY