Developed in-house, not fed back - can't submit new issue
 - community seems dead.
Solaris specific: uses internal implementation of SHA1

--- pwgen-2.06/sha1num.c	2013-11-25 12:09:31.359377740 -0800
+++ pwgen-2.06/sha1num.c	2013-11-25 12:09:26.489379943 -0800
@@ -11,7 +11,16 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include "pwgen.h"
+#ifdef SHA_INTERNAL
 #include "sha1.h"
+#endif
+#ifdef SHA_SOLARIS
+#include <sha1.h>
+#define sha1_context SHA1_CTX
+#define sha1_starts SHA1Init
+#define sha1_update SHA1Update
+#define sha1_finish(a,b) SHA1Final(b,a)
+#endif
 
 sha1_context sha1_ctx;
 char *sha1_seed;
--- pwgen-2.06/configure.in	2013-12-02 02:57:12.022589524 -0800
+++ pwgen-2.06/configure.in	2013-12-02 02:56:10.404769485 -0800
@@ -8,4 +8,23 @@
 AC_PATH_PROG(PERL, perl, perl)
 AC_CHECK_FUNCS(drand48 getopt_long)
 AC_CHECK_HEADERS(getopt.h)
+pwgen_sha="internal"
+SHA_OBJ=""
+SHA_SRC=""
+SHA_LIB=""
+SHA_HEAD=""
+AC_CHECK_LIB(md, SHA1Init, [pwgen_sha="solaris"])
+if test x"$pwgen_sha" = x"internal" ; then
+	CFLAGS="${CFLAGS} -DSHA_INTERNAL"
+	SHA_OBJ="sha1.o"
+	SHA_SRC="sha1.c"
+	SHA_HEAD="sha1.h"
+elif test x"$pwgen_sha" = x"solaris" ; then
+	SHA_LIB="-lmd"
+	CFLAGS="${CFLAGS} -DSHA_SOLARIS"
+fi
+AC_SUBST(SHA_OBJ)
+AC_SUBST(SHA_SRC)
+AC_SUBST(SHA_LIB)
+AC_SUBST(SHA_HEAD)
 AC_OUTPUT(Makefile)
--- pwgen-2.06/Makefile.in	2013-12-02 03:52:49.960581781 -0800
+++ pwgen-2.06/Makefile.in	2013-12-02 03:52:25.323489891 -0800
@@ -19,7 +19,7 @@
 CFLAGS = @CFLAGS@ $(WALL_OPTS)
 CPPFLAGS = @CPPFLAGS@
 ALL_CFLAGS = $(CPPFLAGS) $(DEFS) $(USE_WFLAGS) $(CFLAGS) $(XTRA_CFLAGS) 
-LDFLAGS = @LDFLAGS@
+LDFLAGS = @LDFLAGS@ @SHA_LIB@
 RM = @RM@
 MV = @MV@
 SED = @SED@
@@ -31,9 +31,9 @@
 .c.o:
 	$(CC) -c $(ALL_CFLAGS) $< -o $@
 
-OBJS= pwgen.o pw_phonemes.o pw_rand.o randnum.o sha1.o sha1num.o
+OBJS= pwgen.o pw_phonemes.o pw_rand.o randnum.o @SHA_OBJ@ sha1num.o
 
-SRCS= pwgen.c pw_phonemes.c pw_rand.c randnum.c sha1.c sha1num.c
+SRCS= pwgen.c pw_phonemes.c pw_rand.c randnum.c @SHA_SRC@ sha1num.c
 
 
 pwgen: $(OBJS)
@@ -127,4 +127,4 @@
 pw_rand.o: pw_rand.c pwgen.h
 randnum.o: randnum.c pwgen.h
 sha1.o: sha1.c sha1.h 
-sha1num.o: sha1num.c sha1.h pwgen.h
+sha1num.o: sha1num.c @SHA_HEAD@ pwgen.h