I would like to adopt gimp and related packages.  At the moment I'm having 
trouble with babl, which is needed for gegl0.4, which is needed for gimp.  The 
problem involves gobject-introspection.

If I disable introspection, the build works fine.  This would be OK, since babl 
has been built without introspection for several years.  But then the gegl0.4 
build complains about the missing babl introspection files, so I would have to 
disable introspection there too, which hasn't been done in the past.

So my preference is to figure out what the problem is and get the babl build 
working with introspection.  I'm attaching my cygport file and patch.

Here's the failing command...

/usr/bin/g-ir-scanner -I/usr/include/gobject-introspection-1.0 
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -D_REENTRANT --no-libtool 
--namespace=Babl --nsversion=0.1 --warn-all --output babl/Babl-0.1.gir 
--c-include=babl.h '--identifier-filter-cmd=/usr/bin/python3 
/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/babl/identfilter.py' 
-DBABL_IS_BEING_COMPILED 
-I/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/babl 
-I/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/babl -I./. 
-I../. -I./babl/base/. -I../babl/base/. 
--filelist=/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/babl/4170c83@@babl-0.1@sha/Babl_0.1_gir_filelist 
--cflags-begin -fno-unsafe-math-optimizations -Wdeclaration-after-statement 
-Winit-self -Wmissing-declarations -Wmissing-prototypes -Wold-style-definition 
-Wpointer-arith -mmmx -msse -mfpmath=sse -I./. -I../. -I./babl/base/. 
-I../babl/base/. --cflags-end --library babl-0.1 
-L/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/babl 
--extra-library=m --extra-library=dl --extra-library=lcms2

...and the error message:

g-ir-scanner: link: gcc -o 
/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/tmp-introspectCwCaUc/Babl-0.1.exe 
-ggdb -O2 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 
-fstack-protector-strong --param=ssp-buffer-size=4 
-fdebug-prefix-map=/tmp/cygbabl/babl-0.1.74-1.x86_64/build=/usr/src/debug/babl-0.1.74-1 
-fdebug-prefix-map=/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74=/usr/src/debug/babl-0.1.74-1 
/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/tmp-introspectCwCaUc/Babl-0.1.o 
-L. -lbabl-0.1 -lm -ldl -llcms2 
-L/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/babl 
-Wl,-rpath,/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/babl 
-lgio-2.0 -lgobject-2.0 -Wl,--export-all-symbols -lgmodule-2.0 -lglib-2.0 -lintl
ERROR: can't resolve libraries to shared libraries: babl-0.1

I don't understand the error message, because the command line contains

   -L/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/babl

and that directory contains libbabl-0.1.dll.a and cygbabl-0.1-0.dll.  I even 
tried adding that directory to my PATH to make sure the right cygbabl-0.1-0.dll 
would be found, but that didn't help.

Can anyone help?

Thanks.

Ken