Change reason.cc/h to portreasons.cc/h. This is because of a reason.h on Windows which causes compilation problems. A workaround was employed, but this is incase it pops up again. I also changed the recent CHANGELOG entry mentioning reason.h so there's no confusion

CHANGELOG

@@ -7,7 +7,7 @@ o Fixed an output bug on systems like Windows which return -1 when
   vsnprintf is passed a too-small buffer rather than returning the
   size needed.  Thanks to jah (jah(a)zadkiel.plus.com) for the report.
 
-o Added sys/types.h include to reason.h to help OpenBSD compilation.  
+o Added sys/types.h include to portreasons.h to help OpenBSD compilation.  
   Thanks to Olivier Meyer for the patch.
 
 o Updated IANA assignment IP list for random IP (-iR) generation. [Kris]

Makefile.in

@@ -62,11 +62,11 @@ NSE_OBJS=nse_main.o nse_auxiliar.o nse_nsock.o nse_init.o nse_nmaplib.o nse_debu
 NSESTDLIB=nsestdlib
 endif
 
-export SRCS = main.cc nmap.cc targets.cc tcpip.cc nmap_error.cc utils.cc idle_scan.cc osscan.cc osscan2.cc output.cc scan_engine.cc timing.cc charpool.cc services.cc protocols.cc nmap_rpc.cc portlist.cc NmapOps.cc TargetGroup.cc Target.cc FingerPrintResults.cc service_scan.cc NmapOutputTable.cc MACLookup.cc nmap_tty.cc nmap_dns.cc traceroute.cc reason.cc $(NSE_SRC) @COMPAT_SRCS@
+export SRCS = main.cc nmap.cc targets.cc tcpip.cc nmap_error.cc utils.cc idle_scan.cc osscan.cc osscan2.cc output.cc scan_engine.cc timing.cc charpool.cc services.cc protocols.cc nmap_rpc.cc portlist.cc NmapOps.cc TargetGroup.cc Target.cc FingerPrintResults.cc service_scan.cc NmapOutputTable.cc MACLookup.cc nmap_tty.cc nmap_dns.cc traceroute.cc portreasons.cc $(NSE_SRC) @COMPAT_SRCS@
 
-export HDRS = charpool.h FingerPrintResults.h global_structures.h idle_scan.h MACLookup.h nmap_amigaos.h nmap_dns.h nmap_error.h nmap.h NmapOps.h NmapOutputTable.h nmap_rpc.h nmap_tty.h nmap_winconfig.h osscan.h osscan2.h output.h portlist.h protocols.h scan_engine.h service_scan.h services.h TargetGroup.h Target.h targets.h tcpip.h timing.h utils.h traceroute.h reason.h $(NSE_HDRS)
+export HDRS = charpool.h FingerPrintResults.h global_structures.h idle_scan.h MACLookup.h nmap_amigaos.h nmap_dns.h nmap_error.h nmap.h NmapOps.h NmapOutputTable.h nmap_rpc.h nmap_tty.h nmap_winconfig.h osscan.h osscan2.h output.h portlist.h protocols.h scan_engine.h service_scan.h services.h TargetGroup.h Target.h targets.h tcpip.h timing.h utils.h traceroute.h portreasons.h $(NSE_HDRS)
 
-OBJS = main.o nmap.o targets.o tcpip.o nmap_error.o utils.o idle_scan.o osscan.o osscan2.o output.o scan_engine.o timing.o charpool.o services.o protocols.o nmap_rpc.o portlist.o NmapOps.o TargetGroup.o Target.o FingerPrintResults.o service_scan.o NmapOutputTable.o MACLookup.o nmap_tty.o nmap_dns.o  traceroute.o reason.o $(NSE_OBJS) @COMPAT_OBJS@
+OBJS = main.o nmap.o targets.o tcpip.o nmap_error.o utils.o idle_scan.o osscan.o osscan2.o output.o scan_engine.o timing.o charpool.o services.o protocols.o nmap_rpc.o portlist.o NmapOps.o TargetGroup.o Target.o FingerPrintResults.o service_scan.o NmapOutputTable.o MACLookup.o nmap_tty.o nmap_dns.o  traceroute.o portreasons.o $(NSE_OBJS) @COMPAT_OBJS@
 
 # %.o : %.cc -- nope this is a GNU extension
 .cc.o:

Target.h

@@ -110,7 +110,7 @@
 #include "nse_main.h"
 #endif
 
-#include "reason.h"
+#include "portreasons.h"
 #include "portlist.h"
 #include "tcpip.h"
 

mswin32/nmap.vcproj

@@ -310,7 +310,7 @@
 				>
 			</File>
 			<File
-				RelativePath="..\reason.cc"
+				RelativePath="..\portreasons.cc"
 				>
 			</File>
 			<File
@@ -495,7 +495,7 @@
 				>
 			</File>
 			<File
-				RelativePath="..\reason.h"
+				RelativePath="..\portreasons.h"
 				>
 			</File>
 			<File

output.cc

@@ -108,7 +108,7 @@
 #include "NmapOps.h"
 #include "NmapOutputTable.h"
 #include "MACLookup.h"
-#include "reason.h"
+#include "portreasons.h"
 #include "protocols.h"
 #include "nmap_rpc.h"
 #include "Target.h"

portlist.h

@@ -107,7 +107,7 @@
 #include "nse_main.h"
 #endif 
 
-#include "reason.h"
+#include "portreasons.h"
 
 /* port states */
 #define PORT_UNKNOWN 0

portreasons.cc

@@ -1,5 +1,5 @@
 /***************************************************************************
- * reason.cc -- Verbose packet-level information on port states            *
+ * portreasons.cc -- Verbose packet-level information on port states       *
  *                                                                         *
  ***********************IMPORTANT NMAP LICENSE TERMS************************
  *                                                                         *
@@ -103,7 +103,7 @@
 #include "nmap.h"
 #include "portlist.h"
 #include "NmapOps.h"
-#include "reason.h"
+#include "portreasons.h"
 #include "Target.h"
 #ifdef WIN32
 #include "winfix.h"

portreasons.h

@@ -1,5 +1,5 @@
 /***************************************************************************
- * reason.cc -- Verbose packet-level information on port states            *
+ * portreasons.h -- Verbose packet-level information on port states        *
  *                                                                         *
  ***********************IMPORTANT NMAP LICENSE TERMS************************
  *                                                                         *
@@ -132,7 +132,7 @@ typedef struct port_reason_summary {
 	struct port_reason_summary *next;
 } state_reason_summary_t;
 
-/* reason.h:reason_codes and reason.cc:reason_str must stay in sync */
+/* portreasons.h:reason_codes and portreasons.cc:reason_str must stay in sync */
 enum reason_codes {
 	ER_RESETPEER=0, ER_CONREFUSED, ER_CONACCEPT, 
 	ER_SYNACK, ER_UDPRESPONSE, ER_PROTORESPONSE, 

scan_engine.cc

@@ -103,7 +103,7 @@
 #ifdef WIN32
 #include "nmap_winconfig.h"
 #endif
-#include "reason.h"
+#include "portreasons.h"
 #include <dnet.h>
 #include "scan_engine.h"
 #include "timing.h"

tcpip.cc

@@ -102,7 +102,7 @@
 #ifdef WIN32
 #include "nmap_winconfig.h"
 #endif
-#include "reason.h"
+#include "portreasons.h"
 #include <dnet.h>
 #include "tcpip.h"
 #include "NmapOps.h"