Added check for pthread.h (reported by Steven Edwards).
Removed init_done check, the process heap is now created before kernel
is loaded anyway.

diff --git a/configure b/configure
index 2d149cc..bf4dd7d 100755
--- a/configure
+++ b/configure
@@ -13874,6 +13874,7 @@
 
 
 
+
 for ac_header in \
 	arpa/inet.h \
 	arpa/nameser.h \
@@ -13903,6 +13904,7 @@
 	netinet/tcp.h \
 	netinet/tcp_fsm.h \
 	openssl/ssl.h \
+	pthread.h \
 	pty.h \
 	pwd.h \
 	regex.h \