According to Raimund Steger:

> [...]
> diff --git a/src/Makefile.am b/src/Makefile.am
> index dc082b7..57c34a2 100644
> [...]
> +fcobjshash.gperf: fcobjshash.gperf.h fcobjs.h
> +    $(AM_V_GEN) $(CPP) -I$(top_srcdir) $< | $(GREP) '^[^#]' | awk ' \
> +    /CUT_OUT_BEGIN/ { no_write=1; next; }; \
> +    /CUT_OUT_END/ { no_write=0; next; }; \
> +    { if (!no_write) print; next; }; \
> +    ' - > $@.tmp && \
> +    mv -f $@.tmp $@

Sun Studio CPP seems to insert whitespace in a different way than GCC's CPP.

GCC generates in src/fcobjshash.gperf:

[...]
"family", FC_FAMILY_OBJECT
"familylang", FC_FAMILYLANG_OBJECT
[...]

Sun Studio generates:

[...]
 "family" , FC_FAMILY_OBJECT
 "familylang" , FC_FAMILYLANG_OBJECT
[...]

leading to:

[...]
Making all in src
gmake[2]: Entering directory `/home/rs/src/fontconfig-git/fontconfig/src'
  GEN    fcobjshash.gperf
  GEN    fcobjshash.h
Key link: " " = " ", with key set "".
1 input keys have identical hash values,
use option -D.
gmake[2]: *** [fcobjshash.h] Error 1
gmake[2]: Leaving directory `/home/rs/src/fontconfig-git/fontconfig/src'
gmake[1]: *** [all-recursive] Error 1
gmake[1]: Leaving directory `/home/rs/src/fontconfig-git/fontconfig'
gmake: *** [all] Error 2

...maybe we could tuck in an additional sed to remove the whitespace, like:

[...]
fcobjshash.gperf: fcobjshash.gperf.h fcobjs.h
    $(AM_V_GEN) $(CPP) -I$(top_srcdir) $< | \
    $(SED) 's/^\s*//;s/\s*,\s*/,/;' | \
    $(GREP) '^[^#]' | \
    $(AWK) '/CUT_OUT_BEGIN/,/CUT_OUT_END/ { next; }; { print; };' \
    > $@.tmp && \
    mv -f $@.tmp $@
[...]

though I'm not sure what kind of guarantee CPP can give us/what easier option I might have missed...