On my Linux box 'autogen.sh ; make ; make clean' leaves two files in obj: tif_config.h tiffconf.h.
This simply patch does the job: --- a/base/gs.mak +++ b/base/gs.mak @@ -293,7 +293,7 @@ mostlyclean : config-clean #****** FOLLOWING IS WRONG, NEEDS TO BE PER-SUBSYSTEM ****** config-clean : $(RMN_) $(GSGEN)*.dev $(GSGEN)devs*.tr $(GSGEN)gconfig*.h - $(RMN_) $(GSGEN)gconfx*.h $(GSGEN)j*.h + $(RMN_) $(GSGEN)gconfx*.h $(GSGEN)j*.h $(GSGEN)tif*.h $(RMN_) $(GSGEN)c*.tr $(GSGEN)o*.tr $(GSGEN)l*.tr # Macros for constructing the *.dev files that describe features and Somebody else can review and commit.
The patch has been committed as a rev. 11540.