Get working ror libnix and clib2

README.md

@@ -288,12 +288,14 @@ docker run --rm \
     -e USER=$( id -u ) -e GROUP=$( id -g ) \
     -it  sacredbanana/amiga-compiler:m68k-amigaos bash
 cd json-c-build
-cmake ..
+cmake -DM68K_CRT=newlib ..
 make
 ```
 
 libjson-c.a will get created in the json-c-build directory.
 
+You can change newlib to nix20, nix13 or clib2 if you would like to build the library suited for libnix or clib2 instead. Newlib is default.
+
 To build for PowerPC Amiga:
 
 ```