Index: trunk/psLib/configure.ac
===================================================================
--- trunk/psLib/configure.ac	(revision 5070)
+++ trunk/psLib/configure.ac	(revision 5219)
@@ -156,6 +156,9 @@
 PSLIB_CFLAGS="${PSLIB_CFLAGS=} ${CFITSIO_CFLAGS}"
 PSLIB_LIBS="${PSLIB_LIBS=} $CFITSIO_LDFLAGS -lcfitsio"
+TMP_CFLAGS=${CFLAGS}
+CFLAGS=${CFITSIO_CFLAGS}
 AC_CHECK_HEADERS([fitsio.h],[],
    [AC_MSG_ERROR([CFITSIO is required.  Obtain it at  http://heasarc.gsfc.nasa.gov/docs/software/fitsio or use --with-cfitsio to specify location.])])
+CFLAGS=${TMP_CFLAGS}
 
 AC_SUBST([CFITSIO_CFLAGS])
@@ -174,7 +177,9 @@
 PSLIB_CFLAGS="${PSLIB_CFLAGS=} ${FFTW3_CFLAGS}"
 PSLIB_LIBS="${PSLIB_LIBS=} $FFTW3_LDFLAGS -lfftw3f"
-AC_MSG_CHECKING([FFTW header files])
+TMP_CFLAGS=${CFLAGS}
+CFLAGS=${FFTW3_CFLAGS}
 AC_CHECK_HEADERS([fftw3.h],[],
    [AC_MSG_ERROR([FFTW version 3 with float support is required.  Obtain it at http://www.fftw.org/or use --with-fftw3 to specify location.])])
+CFLAGS=${TMP_CFLAGS}
 
 AC_SUBST([FFTW3_CFLAGS])