In configure.ac the following:
dnl ===================================================================
dnl We need touch with -h option support.
dnl ===================================================================
AC_PATH_PROG(TOUCH, touch)
test -z "$TOUCH" && AC_MSG_ERROR([touch is required])
touch warn
if ! "$TOUCH" -h warn 2>/dev/null > /dev/null; then
    AC_MSG_ERROR([touch version with -h option support is required to build, please install it and make sure it is the one found first in PATH],,)
fi

great, for gnu platforms, but many Unix distros put gnu coreutils in, for example, /usr/gnu/bin and symlink (in this case) 
/usr/bin/gtouch ==> /usr/gnu/bin/touch

The only place this seems to be used at the moment is in solenv/gbuild/Deliver.mk
but here, as in many places (though not all).  So this patch initially created by pkgsrc developer Ryo ONODERA and updated by me seems to allow the special 'touch' ;-).    BTW, up til now, replace '-hr' by simply '-r' has seemed to work.

========================>8==================================================
--- solenv/gbuild/Deliver.mk.orig	2014-04-30 19:49:45.000000000 +0000
+++ solenv/gbuild/Deliver.mk
@@ -51,7 +51,7 @@ endif
 endef
 
 define gb_Deliver__deliver
-$(if $(gb_Deliver_CLEARONDELIVER),rm -f $(2) &&) $(if $(gb_Deliver_HARDLINK),ln,cp -P -f) $(1) $(2) && touch -hr $(1) $(2)
+$(if $(gb_Deliver_CLEARONDELIVER),rm -f $(2) &&) $(if $(gb_Deliver_HARDLINK),ln,cp -P -f) $(1) $(2) && $(TOUCH) -hr $(1) $(2)
 endef
 
 ifneq ($(strip $(gb_Deliver_GNUCOPY)),)
========================>8==================================================

by the way, it would be nice for us bearded folks who don't habitually put /usr/gnu/bin into our PATH to allow a configure option like for '--with-gnu-cp' or '--with-gnu-patch'... '--with-gnu-touch' seems appropriate *IFF* this single use of 'touch' is really necessary!