kc3-lang/SDL

diff --git a/test/configure b/test/configure
index e789962..7a93cca 100755
--- a/test/configure
+++ b/test/configure
@@ -584,6 +584,8 @@ PACKAGE_URL=
 ac_unique_file="loopwave.c"
 ac_subst_vars='LTLIBOBJS
 LIBOBJS
+libunwind_LIBS
+libunwind_CFLAGS
 SDL_TTF_LIB
 XLIB
 GLES2LIB
@@ -681,7 +683,9 @@ PKG_CONFIG_LIBDIR
 SDL_CFLAGS
 SDL_LIBS
 XMKMF
-CPP'
+CPP
+libunwind_CFLAGS
+libunwind_LIBS'
 
 
 # Initialize some variables set by options.
@@ -1323,6 +1327,10 @@ Some influential environment variables:
   SDL_LIBS    linker flags for SDL, overriding pkg-config
   XMKMF       Path to xmkmf, Makefile generator for X Window System
   CPP         C preprocessor
+  libunwind_CFLAGS
+              C compiler flags for libunwind, overriding pkg-config
+  libunwind_LIBS
+              linker flags for libunwind, overriding pkg-config
 
 Use these variables to override the choices made by `configure' or to help
 it to find libraries and programs with nonstandard names/locations.
@@ -4020,6 +4028,96 @@ if test x$have_SDL_ttf = xyes; then
 fi
 
 
+
+pkg_failed=no
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for libunwind" >&5
+$as_echo_n "checking for libunwind... " >&6; }
+
+if test -n "$libunwind_CFLAGS"; then
+    pkg_cv_libunwind_CFLAGS="$libunwind_CFLAGS"
+ elif test -n "$PKG_CONFIG"; then
+    if test -n "$PKG_CONFIG" && \
+    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"libunwind\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "libunwind") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; then
+  pkg_cv_libunwind_CFLAGS=`$PKG_CONFIG --cflags "libunwind" 2>/dev/null`
+else
+  pkg_failed=yes
+fi
+ else
+    pkg_failed=untried
+fi
+if test -n "$libunwind_LIBS"; then
+    pkg_cv_libunwind_LIBS="$libunwind_LIBS"
+ elif test -n "$PKG_CONFIG"; then
+    if test -n "$PKG_CONFIG" && \
+    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"libunwind\""; } >&5
+  ($PKG_CONFIG --exists --print-errors "libunwind") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; then
+  pkg_cv_libunwind_LIBS=`$PKG_CONFIG --libs "libunwind" 2>/dev/null`
+else
+  pkg_failed=yes
+fi
+ else
+    pkg_failed=untried
+fi
+
+
+
+if test $pkg_failed = yes; then
+   	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+
+if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
+        _pkg_short_errors_supported=yes
+else
+        _pkg_short_errors_supported=no
+fi
+        if test $_pkg_short_errors_supported = yes; then
+	        libunwind_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors "libunwind" 2>&1`
+        else
+	        libunwind_PKG_ERRORS=`$PKG_CONFIG --print-errors "libunwind" 2>&1`
+        fi
+	# Put the nasty error message in config.log where it belongs
+	echo "$libunwind_PKG_ERRORS" >&5
+
+	as_fn_error $? "Package requirements (libunwind) were not met:
+
+$libunwind_PKG_ERRORS
+
+Consider adjusting the PKG_CONFIG_PATH environment variable if you
+installed software in a non-standard prefix.
+
+Alternatively, you may set the environment variables libunwind_CFLAGS
+and libunwind_LIBS to avoid the need to call pkg-config.
+See the pkg-config man page for more details." "$LINENO" 5
+elif test $pkg_failed = untried; then
+     	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+	{ { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "The pkg-config script could not be found or is too old.  Make sure it
+is in your PATH or set the PKG_CONFIG environment variable to the full
+path to pkg-config.
+
+Alternatively, you may set the environment variables libunwind_CFLAGS
+and libunwind_LIBS to avoid the need to call pkg-config.
+See the pkg-config man page for more details.
+
+To get pkg-config, see <http://pkg-config.freedesktop.org/>.
+See \`config.log' for more details" "$LINENO" 5; }
+else
+	libunwind_CFLAGS=$pkg_cv_libunwind_CFLAGS
+	libunwind_LIBS=$pkg_cv_libunwind_LIBS
+        { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+	LIBS="$LIBS $libunwind_LIBS"
+fi
+
 ac_config_files="$ac_config_files Makefile"
 
 cat >confcache <<\_ACEOF