--- a/INSTALL.md	Thu Mar 12 12:44:00 2020 +0100
+++ b/INSTALL.md	Thu Mar 12 20:22:02 2020 +0100
@@ -7,7 +7,8 @@
 ------------
 
 - C11 compliant compiler,
-- POSIX system (make, ar, shell, some POSIX functions),
+- POSIX system (make, ar, shell),
+- [pkg-config][], Helper for libraries.
 - [Jansson][], JSON parsing library,
 - [SDL2][], Multimedia library,
 - [SDL2_image][], Image loading addon for SDL2,
@@ -37,14 +38,17 @@
 appropriate MinGW shell prior to the chapter above.
 
 - *make*
+- *mingw-w64-x86_64-pkg-config*
 - *mingw-w64-x86_64-gcc*
-- *mingw-w64-x86_64-expat* (only for molko-map tool)
 - *mingw-w64-x86_64-SDL2*
 - *mingw-w64-x86_64-SDL2_image*
 - *mingw-w64-x86_64-SDL2_mixer*
 - *mingw-w64-x86_64-SDL2_ttf*
+- *mingw-w64-x86_64-jansson* (only for molko-map tool)
 
-Note: replace `x86_64` with `i686` if you have a deprecated system.
+Note: replace `x86_64` with `i686` if you have a deprecated system or if you
+      have issues while debugging (MinGW-w64 and/or gdb have known issues in
+      this area).
 
 [Jansson][]: http://www.digip.org/jansson
 [SDL2]: http://libsdl.org
@@ -52,3 +56,4 @@
 [SDL2_ttf]: https://www.libsdl.org/projects/SDL_ttf
 [SDL2_mixer]: https://www.libsdl.org/projects/SDL_mixer
 [MSYS2]: http://www.msys2.org
+[pkg-config]: http://pkgconf.org