sslstream.c:715: error: `FIONBIO' undeclared (first use in this function)

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Building on Open Solaris:

   bash-3.00$ uname -a
   SunOS simandl 5.11 snv_50 i86pc i386 i86pc Solaris
   bash-3.00$ head -39 config.log
   This file contains any messages produced by compilers while
   running configure, to aid debugging if configure makes a mistake.

   It was created by tn5250 configure 0.17.4, which was
   generated by GNU Autoconf 2.61.  Invocation command line was

     $ ./configure

   ## --------- ##
   ## Platform. ##
   ## --------- ##

   hostname = simandl
   uname -m = i86pc
   uname -r = 5.11
   uname -s = SunOS
   uname -v = snv_50

   /usr/bin/uname -p = i386
   /bin/uname -X     = System = SunOS
   Node = simandl
   Release = 5.11
   KernelID = snv_50
   Machine = i86pc
   BusType = <unknown>
   Serial = <unknown>
   Users = <unknown>
   OEM# = 0
   Origin# = 1
   NumCPU = 2

   /bin/arch              = i86pc
   /usr/bin/arch -k       = i86pc
   /usr/convex/getsysinfo = unknown
   /usr/bin/hostinfo      = unknown
   /bin/machine           = unknown
   /usr/bin/oslevel       = unknown
   /bin/universe          = unknown

   bash-3.00$ gcc --version
   gcc (GCC) 3.4.3 (csl-sol210-3_4-20050802)
   bash-3.00$ make
   make  all-recursive
   make[1]: Entering directory `/usr/local/src/TN5250/tn5250'
   Making all in lib5250
   make[2]: Entering directory `/usr/local/src/TN5250/tn5250/lib5250'
   if /bin/bash ../libtool --mode=compile --tag=CC gcc -DHAVE_CONFIG_H

   ".deps/sslstream.Tpo" -c -o sslstream.lo sslstream.c; \
   then mv -f ".deps/sslstream.Tpo" ".deps/sslstream.Plo"; else rm -f
   ".deps/sslstream.Tpo"; exit 1; fi
    gcc -DHAVE_CONFIG_H -I. -I. -I.. -DSYSCONFDIR=\"/usr/local/etc\"
   -I/usr/local/ssl/include -g -O2 -MT sslstream.lo -MD -MP -MF
   .deps/sslstream.Tpo -c sslstream.c  -fPIC -DPIC -o .libs/sslstream.o
   sslstream.c: In function `ssl_stream_connect':
   sslstream.c:715: error: `FIONBIO' undeclared (first use in this
   function)
   sslstream.c:715: error: (Each undeclared identifier is reported only
   once
   sslstream.c:715: error: for each function it appears in.)
   make[2]: *** [sslstream.lo] Error 1
   make[2]: Leaving directory `/usr/local/src/TN5250/tn5250/lib5250'
   make[1]: *** [all-recursive] Error 1
   make[1]: Leaving directory `/usr/local/src/TN5250/tn5250'
   make: *** [all] Error 2

PS I just built OpenSSL fresh from latest source.