addittion to README.

README.md

@@ -5,3 +5,21 @@ Apache2 and other HTTP servers.
 
 It parses HTTP headers and URL-encoded strings. It also takes care of sending
 responses including headers and error codes/messages.
+
+
+## Build AqCGI
+
+### Dependencies
+
+AqCGI only depends on libgwenhywfar (see [gwenhywfar](https://www.aquamaniac.de/rdm/projects/gwenhywfar/files)).
+
+### Build
+Download and unpack tar.gz file, CD into the unpacked folder and build like this:
+'''
+mkdir build
+cd build
+gwbuild -s ..
+gwbuild -jNN (with NN being the number of parallel processes to use, e.g. 4 if compiling on quadcore cpu)
+sudo gwbuild -i
+'''
+