The RcppCWB includes a patched version of the Corpus Workbench (CWB). RcppCWB versions up top v0.4.4 included a manually patched version of CWB (v3.4.14 / SVN revision 1069). But this is a serious limitation to incorporate the updates and improvements of the original CWB code.

Automated patches are not performed using the PatchEngine R6 class defined in the file unsurprisingly named PatchEngine.R. At the current stage of development, automated patches will yield a 1:1 reconstruction of the manual patches introduced over the years for CWB v3.4.14 (r1069). Catching up with the latest version of CWB (r1690) is still work in progress.

• bison: The PatchCWB mechanism has been developed using GNU Bison 2.3. The latest version installable via brew is v3.7.4. Note that the latest version available would be v3.8.

• flex: The PatchCWB mechanism has been developed using flex 2.5.35 Apple(flex-32). An Update of the Xcode command line developer tools includes flex 2.6.4 Apple(flex-34), which is the latest version to date. This (v2.6.4) is the version used for the patches.

• makeheaders: Utility to generate a C header file from the original C code. Available via Fossil and at GitHub. To build the executable, cd into the directory with makeheaders.c and run:

gcc -c makeheaders.c
gcc makeheaders.o -o makeheaders

• We do not patch the general Makefile but copy a manually patched version of r1069: The diffs between r1069 and r1690 show differences with new targets, but not relevant here.
• The Makefile utils/Makefile is copied in - r1690 has better verbosity but does not change substantially anything

• To avoid warning of implicit function declaration, the header file time.h is added ("#include <time.h>"" in addition to sys/time.h) in cwb/cqp/sgml-print.c ; latex-print.c ; ascii-print.c ; html-print.c

• check whether newer version of flex and bison yield different results (does flex/bison version matter? require different patches?)