It's "#elif", not "#elsif".

       * (Platform: debug-solaris-sparcv9-gcc)

       */

		if (!BN_mod_exp(r, a, r, b, ctx)) goto err;

#elsif 0

#elif 0

		if (!BN_mod_exp_recp(r, a, r, b, ctx)) goto err;

#else

		if (!BN_mod_exp_simple(r, a, r, b, ctx)) goto err;

#endif

/*

On my Linux system, all variants of BN_mod_exp appear to work here,

but a SIGSEGV occurs later:

Program received signal SIGSEGV, Segmentation fault.

0x40066e59 in   ()

(gdb) bt

#0  0x40066e59 in   ()

#1  0x40066d3e in   ()

#2  0x805e64a in CRYPTO_free (str=0x807d968) at mem.c:248

#3  0x804f68f in bn_expand2 (b=0x807d6b4, words=10) at bn_lib.c:438

#4  0x8055366 in BN_lshift (r=0x807d6b4, a=0x807d68c, n=63) at bn_shift.c:132

#5  0x804ca7a in BN_div (dv=0x0, rm=0x807d68c, num=0x807d68c, 

    divisor=0x807d678, ctx=0x807d610) at bn_div.c:205

#6  0x805391a in BN_nnmod (r=0x807d68c, m=0x807d68c, d=0x807d678, 

    ctx=0x807d610) at bn_mod.c:132

#7  0x8056198 in BN_kronecker (a=0x807d664, b=0x807d848, ctx=0x807d610)

    at bn_kron.c:170

#8  0x805d351 in BN_mod_sqrt (in=0x807d860, a=0x807d830, p=0x807d848, 

    ctx=0x807d610) at bn_sqrt.c:165

#9  0x804b365 in test_sqrt (bp=0x807d7e8, ctx=0x807d610) at bntest.c:1057

#10 0x8048da8 in main (argc=0, argv=0xbffffbb8) at bntest.c:240

#11 0x4002f78a in   ()

These symptoms indicate that the error probably happens earlier

in the program.  I've disabled the calls to all earlier test_...

functions and replaced BN_generate_prime by BN_set_word(.., 65537)

in bntest.c, but this does not help.

 */

		if (BN_is_word(r, 1))

			legendre = 1;

		else