Look for png.h and jpeglib.h in FLTK_INC path (i.e. after calling fltk-config).

Use static GLEW library under mingw (libglew32.a rather than libglew32.dll.a).

src/configure.in

@@ -22,7 +22,7 @@ dnl -- checks for system services
 
 AC_HEADER_STDC
 AC_CHECK_FUNCS(strchr memcpy snprintf strcasecmp rint sqrtf)
-AC_CHECK_HEADERS(malloc.h zlib.h png.h jpeglib.h)
+AC_CHECK_HEADERS(malloc.h zlib.h)
 AC_FUNC_ALLOCA
 
 AC_PROG_CC
@@ -132,6 +132,10 @@ if test -z "$FLTK_INC"; then
     AC_MSG_WARN("Couldn't find fltk-config -- is fltk 1.1.x (or later) installed?")
 fi
 
+CXXFLAGS="$CXXFLAGS $FLTK_INC"
+CFLAGS="$CFLAGS $FLTK_INC"
+AC_CHECK_HEADERS(png.h jpeglib.h)
+
 
 #----------- as of partiview 0.7.04 - marx: ------------------------------------
 #we no longer support old file chooser so we deleted support for it from this file
@@ -285,7 +289,8 @@ if test -n "$with_glew" && test "$with_glew" != "no"; then
     if test -d "$with_glew"; then
 	AC_DEFINE(HAVE_LIBGLEW, [], [Define if GLEW extension library is present])
 	if test -n "$MINGW32"; then
-	    GLEW_LIB="$with_glew/lib/libglew32.dll.a"
+#	    GLEW_LIB="$with_glew/lib/libglew32.dll.a"
+	    GLEW_LIB="$with_glew/lib/libglew32.a"
 	else
 	    GLEW_LIB="$with_glew/lib/libGLEW.a"
 	fi