diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
-AC_PREREQ([2.68])
-AC_INIT([CADS_fits2jpeg], [1.0], [cads@iiap.res.in])
+AC_INIT([CADS_fits2jpeg], [2.1], [cads@iiap.res.in])
+AC_LANG_C
+AM_INIT_AUTOMAKE([-Wall -Werror])
AC_CONFIG_SRCDIR([config.h.in])
AC_CONFIG_HEADERS([config.h])
-AM_INIT_AUTOMAKE(CADS_fits2jpeg, 1.0)
# Checks for programs.
-AC_PROG_CXX
AC_PROG_CC
-AC_PROG_CPP
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_MAKE_SET
-AC_PROG_RANLIB
# Checks for libraries.
# Checks for header files.
-AC_CHECK_HEADERS([stdlib.h string.h])
+#AC_CHECK_HEADERS([string.h math.h float.h ctype.h libgen.h dirent.h])
+#AC_CHECK_HEADERS([sys/stat.h sys/types.h])
# Checks for typedefs, structures, and compiler characteristics.
+
# Checks for library functions.
AC_FUNC_MALLOC
-LIBS="$LIBS -lm -Wall -pedantic"
-
LIBS="$LIBS -L/usr/lib64 -L/usr/lib -lm -ljpeg -lcfitsio"
-CFLAGS="-ansi $CFLAGS -I/usr/include -I/usr/include/cfitsio"
+CFLAGS="-ansi -Wall $CFLAGS -I/usr/include -I/usr/include/cfitsio"
#---------------------------------------------------------------------#
# Now we check for cfitsio headers and library #
#---------------------------------------------------------------------#