Ok, using AC_TRY_COMPILE while configuring w/ OpenSSL fails when configuring normally (non-cross) & ssl is present. So now we use the AC_TRY_RUN if cross compiling, and assume presence otherwise (since the subsequent header exists checks fail if it's not actually there.)

configure

@@ -7139,6 +7139,15 @@ else
 
 		# Basic test to check for compatible library and
 		# correct linking
+		if test "$cross_compiling" = yes; then
+                        found_crypto=1
+                else
+		if test "$cross_compiling" = yes; then :
+  { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "cannot run test program while cross compiling
+See \`config.log' for more details" "$LINENO" 5; }
+else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -7152,22 +7161,18 @@ int main(void)
 	return(RAND_status() <= 0);
 }
 
-int
+_ACEOF
-main ()
+if ac_fn_c_try_run "$LINENO"; then :
-{
 
 				found_crypto=1
 				break;
 
-  ;
+fi
-  return 0;
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
-}
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
-_ACEOF
+fi
-if ac_fn_c_try_compile "$LINENO"; then :
-
 
                 fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
 		if test ! -z "$found_crypto" ; then
 			break;

configure.ac

@@ -371,7 +371,10 @@ then
 
 		# Basic test to check for compatible library and
 		# correct linking
-		AC_TRY_COMPILE(
+		if test "$cross_compiling" = yes; then
+                        found_crypto=1
+                else       
+		AC_TRY_RUN(
 			[
 #include <string.h>
 #include <openssl/rand.h>
@@ -388,6 +391,7 @@ int main(void)
 				break;
 			], []
 		)
+                fi
 
 		if test ! -z "$found_crypto" ; then
 			break;