userland: convert make to python

README.adoc

@@ -502,8 +502,8 @@ Now rebuild GCC, the program and re-run it:
 and the new ouptut is now:
 
 ....
-j = 0
 i = 2
+j = 0
 ....
 
 We need to use the ugly `-final` thing because GCC has to packages in Buildroot, `-initial` and `-final`: https://stackoverflow.com/questions/54992977/how-to-select-an-override-srcdir-source-for-gcc-when-building-buildroot No one is able to example precisely with a minimal example why this is required:
@@ -5992,7 +5992,7 @@ Bibliography: https://stackoverflow.com/questions/8516021/proc-create-example-fo
 
 ===== /proc/version
 
-Its data is shared with `uname()`, which is a POSIX C function and has a Linux syscall to back it up.
+Its data is shared with `uname()`, which is a <<posix,POSIX C>> function and has a Linux syscall to back it up.
 
 Where the data comes from and how to modify it:
 
@@ -8195,7 +8195,7 @@ TODO a large chunk of tests, the Open POSIX test suite, is disabled with a comme
 
 ==== stress
 
-POSIX userland stress. Two versions:
+<<posix>> userland stress. Two versions:
 
 ....
 ./build-buildroot \
@@ -13117,6 +13117,28 @@ TODO: OpenMP does not like `-static`:
 
 See: https://stackoverflow.com/questions/23869981/linking-openmp-statically-with-gcc
 
+===== userland cheats
+
+We have accumulated considerable material in the following userland subjects.
+
+====== C
+
+Programs under link:userland/c/[] are examples of link:https://en.wikipedia.org/wiki/ANSI_C[ANSI C] programming.
+
+[[cpp]]
+====== C++
+
+Programs under link:userland/cpp/[] are examples of link:https://en.wikipedia.org/wiki/C%2B%2B#Standardization[ISO C] programming.
+
+====== POSIX
+
+Programs under link:userland/posix/[] are examples of POSIX C programming.
+
+What is POSIX:
+
+* https://stackoverflow.com/questions/1780599/what-is-the-meaning-of-posix/31865755#31865755
+* https://unix.stackexchange.com/questions/11983/what-exactly-is-posix/220877#220877
+
 ==== buildroot_packages directory
 
 Source: link:buildroot_packages/[]