The object file is o_str.o, not o_str.c.

Thanks to Peter Sylvester <Peter.Sylvester@EdelWeb.fr> for the notification.

crypto/Makefile.ssl

@@ -38,7 +38,7 @@ GENERAL=Makefile README crypto-lib.com install.com
 LIB= $(TOP)/libcrypto.a
 SHARED_LIB= libcrypto$(SHLIB_EXT)
 LIBSRC=	cryptlib.c mem.c mem_clr.c mem_dbg.c cversion.c ex_data.c tmdiff.c cpt_err.c ebcdic.c uid.c o_time.c o_str.c
-LIBOBJ= cryptlib.o mem.o mem_clr.o mem_dbg.o cversion.o ex_data.o tmdiff.o cpt_err.o ebcdic.o uid.o o_time.o o_str.c
+LIBOBJ= cryptlib.o mem.o mem_clr.o mem_dbg.o cversion.o ex_data.o tmdiff.o cpt_err.o ebcdic.o uid.o o_time.o o_str.o
 
 SRC= $(LIBSRC)