diff --git a/src/c/stacks.d b/src/c/stacks.d
index e14d52fd3..2f025b464 100644
--- a/src/c/stacks.d
+++ b/src/c/stacks.d
@@ -582,7 +582,7 @@ init_stacks(cl_env_ptr env, char *new_cs_org)
 #endif
 	cs_set_size(env, ecl_get_option(ECL_OPT_C_STACK_SIZE));
 
-#if defined(HAVE_SIGPROCMASK) && defined(SA_SIGINFO)
+#if defined(HAVE_SIGPROCMASK) && defined(SA_SIGINFO) && defined(SA_ONSTACK)
 	if (ecl_get_option(ECL_OPT_SIGALTSTACK_SIZE)) {
 		stack_t new_stack;
 		cl_index size = ecl_get_option(ECL_OPT_SIGALTSTACK_SIZE);
diff --git a/src/c/unixint.d b/src/c/unixint.d
index 2e338cea9..d8d66a06f 100644
--- a/src/c/unixint.d
+++ b/src/c/unixint.d
@@ -161,9 +161,11 @@ mysignal(int code, void (*handler)(int, siginfo_t *, void*))
 	new_action.sa_sigaction = handler;
 	sigemptyset(&new_action.sa_mask);
 	new_action.sa_flags = SA_SIGINFO;
+# ifdef SA_ONSTACK
 	if (code == SIGSEGV) {
 		new_action.sa_flags |= SA_ONSTACK;
 	}
+# endif
 #else
 	new_action.sa_handler = handler;
 	sigemptyset(&new_action.sa_mask);
diff --git a/src/compile.lsp.in b/src/compile.lsp.in
index dda274245..45ef95ef1 100644
--- a/src/compile.lsp.in
+++ b/src/compile.lsp.in
@@ -178,7 +178,7 @@
 ;;;
 ;;; * PROFILE
 ;;;
-#+WANTS-PROFILE
+#+(and WANTS-PROFILE (not cygwin))
 (build-module "profile"
               '("ext:profile;profile.lisp")
               :dir "build:ext;"