diff --git a/configure.ac b/configure.ac
index dbcf0dc6..38be9f8f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -235,6 +235,7 @@ function buildSDL() {
    CXXFLAGS="${CXXFLAGS} -fno-rtti -std=c++14"
 
    dnl preconfigured values for SDL build
+   AC_DEFINE_UNQUOTED([_SDL_VERSION], ["`sdl2-config --version` "], [SDL library version])
    AC_DEFINE(_SDL, 1, [Defined when building SDL version])
    AC_DEFINE(_UnixOS, 1, [Building under Unix like systems.])
    AC_DEFINE(IMPL_DEV_READ, 1, [Implement dev_read()])
@@ -416,6 +417,7 @@ function buildFLTK() {
    defaultConditionals
 
    dnl preconfigured values for FLTK build
+   AC_DEFINE_UNQUOTED([_FLTK_VERSION], ["`fltk-config --version` "], [FLTK library version])
    AC_DEFINE(_UnixOS, 1, [Building under Unix like systems.])
    AC_DEFINE(_FLTK, 1, [Defined for FLTK build.])
    AC_DEFINE(IMPL_DEV_READ, 1, [Implement dev_read()])
diff --git a/src/common/sys.h b/src/common/sys.h
index 08e751ae..ac929943 100644
--- a/src/common/sys.h
+++ b/src/common/sys.h
@@ -72,11 +72,11 @@ extern "C" {
 
 // SB's constants
 #if defined(_SDL)
- #define SB_STR_VER VERSION " SDL " SB_VERSYS SB_BIT_SZ BUILD_DATE
+ #define SB_STR_VER VERSION " SDL " _SDL_VERSION SB_VERSYS SB_BIT_SZ BUILD_DATE
 #elif defined (_ANDROID)
   #define SB_STR_VER VERSION " Android " BUILD_DATE
 #elif defined (_FLTK)
-  #define SB_STR_VER VERSION " FLTK " BUILD_DATE
+  #define SB_STR_VER VERSION " FLTK " _FLTK_VERSION SB_VERSYS SB_BIT_SZ BUILD_DATE
 #elif defined (_EMCC)
   #define SB_STR_VER VERSION " Emscripten " BUILD_DATE
 #else