Instead of using find(1) in font/devpdf/Makefile.sub just use grep(1) following
what upstream does (-maxdepth option can be problematic on some platforms).

Should fix pkg/51332 reported by Hiroshi Hakoyama

From <maya>

Index: Makefile
===================================================================
RCS file: /cvsroot/pkgsrc/textproc/groff/Makefile,v
retrieving revision 1.83
diff -u -p -r1.83 Makefile
--- Makefile	9 Jul 2016 06:39:05 -0000	1.83
+++ Makefile	3 Aug 2016 10:09:02 -0000
@@ -1,7 +1,7 @@
 # $NetBSD: Makefile,v 1.83 2016/07/09 06:39:05 wiz Exp $
 
 DISTNAME=	groff-1.22.3
-PKGREVISION=	3
+PKGREVISION=	4
 CATEGORIES=	textproc
 MASTER_SITES=	${MASTER_SITE_GNU:=groff/}
 
Index: distinfo
===================================================================
RCS file: /cvsroot/pkgsrc/textproc/groff/distinfo,v
retrieving revision 1.24
diff -u -p -r1.24 distinfo
--- distinfo	4 Nov 2015 01:59:29 -0000	1.24
+++ distinfo	3 Aug 2016 10:09:02 -0000
@@ -6,4 +6,5 @@ SHA512 (groff-1.22.3.tar.gz) = c526ab203
 Size (groff-1.22.3.tar.gz) = 4188772 bytes
 SHA1 (patch-aa) = 3f5d2c29397377f673a863e0ea953eaac4088898
 SHA1 (patch-ab) = 64ba9805a0798bfce543a258cd66347caa1bf860
+SHA1 (patch-font_devpdf_Makefile.sub) = 2d73140fe036cf48fe93eea3ad71a273c181e298
 SHA1 (patch-src_libs_libgroff_tmpfile.cpp) = 3794a028dc7c569e5adea6b7b876c3ac085376ba
Index: patches/patch-font_devpdf_Makefile.sub
===================================================================
RCS file: patches/patch-font_devpdf_Makefile.sub
diff -N patches/patch-font_devpdf_Makefile.sub
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ patches/patch-font_devpdf_Makefile.sub	3 Aug 2016 10:09:02 -0000
@@ -0,0 +1,19 @@
+$NetBSD$
+
+Solaris find(1) doesn't have -maxdepth. Adapt new logic from upstream that
+avoid to use find for that (this will not needed for future groff version).
+pkg/51332
+
+--- font/devpdf/Makefile.sub.orig	2014-11-04 08:38:35.427521472 +0000
++++ font/devpdf/Makefile.sub
+@@ -21,9 +21,7 @@
+ # along with this program. If not, see <http://www.gnu.org/licenses/>.
+ 
+ DEV=pdf
+-GROFF_FONT_FILES=`cd $(top_builddir)/font/devpdf \
+-                  && find * -maxdepth 0 -type f ! -name 'Makefile.sub*' \
+-                            -exec grep -l internalname {} \;`
++GROFF_FONT_FILES=`cd $(top_builddir)/font/devpdf && grep -l internalname * | grep -v Makefile.sub`
+ ENC_FILES=`cd $(top_builddir)/font/devpdf; ls enc/*`
+ MAP_FILES=`cd $(top_builddir)/font/devpdf; ls map/*`
+