#! /bin/sh
-libtoolize=libtoolize
+GLOBAL_ERROR_INDICATOR=0
-if which glibtoolize > /dev/null 2>&1; then
- libtoolize=glibtoolize
+check_for_application ()
+{
+ for PROG in "$@"
+ do
+ which "$PROG" >/dev/null 2>&1
+ if test $? -ne 0; then
+ cat >&2 <<EOF
+WARNING: \`$PROG' not found!
+ Please make sure that \`$PROG' is installed and is in one of the
+ directories listed in the PATH environment variable.
+EOF
+ GLOBAL_ERROR_INDICATOR=1
+ fi
+ done
+}
+
+check_for_application lex bison autoheader aclocal automake autoconf
+
+# Actually we don't need the pkg-config executable, but we need the M4 macros.
+# We check for `pkg-config' here and hope that M4 macros will then be
+# available, too.
+check_for_application pkg-config
+
+libtoolize=""
+libtoolize --version >/dev/null 2>/dev/null
+if test $? -eq 0
+then
+ libtoolize=libtoolize
+else
+ glibtoolize --version >/dev/null 2>/dev/null
+ if test $? -eq 0
+ then
+ libtoolize=glibtoolize
+ else
+ cat >&2 <<EOF
+WARNING: Neither \`libtoolize' nor \`glibtoolize' have been found!
+ Please make sure that one of them is installed and is in one of the
+ directories listed in the PATH environment variable.
+EOF
+ GLOBAL_ERROR_INDICATOR=1
+ fi
+ fi
+
+if test "$GLOBAL_ERROR_INDICATOR" != "0"
+then
+ exit 1
fi
set -x