diff --git a/SConstruct b/SConstruct
index 38148b4e69d..c318912e061 100644
--- a/SConstruct
+++ b/SConstruct
@@ -408,6 +408,8 @@ def doConfigure( myenv , needJava=True , needPcre=True , shell=False ):
         myCheckLib( "pcrecpp" , True )
         myCheckLib( "pcre" , True )
 
+    myenv["_HAVEPCAP"] = myCheckLib( "pcap" )
+
     if shell:
         haveReadLine = False
         if darwin:
@@ -546,7 +548,7 @@ perftest = testEnv.Program( "perftest", "dbtests/perf/perftest.cpp" )
 clientTests += [ clientEnv.Program( "clientTest" , [ "client/examples/clientTest.cpp" ] ) ]
 
 # --- sniffer ---
-if nix and darwin:
+if darwin or clientEnv["_HAVEPCAP"]:
     sniffEnv = clientEnv.Clone()
     sniffEnv.Append( LIBS=[ "pcap" ] )
     sniffEnv.Program( "mongosniff" , "tools/sniffer.cpp" )
diff --git a/stdafx.h b/stdafx.h
index adcfe89e881..caab527aa50 100644
--- a/stdafx.h
+++ b/stdafx.h
@@ -280,13 +280,17 @@ namespace mongo {
        use this to log things just there.
     */
 #if defined(_WIN32)
-#define DEV if( 0 )
 #define WIN if( 1 )
 #else
-#define DEV if( 0 )
 #define WIN if( 0 )
 #endif
 
+#if defined(_DEBUG)
+#define DEV if( 1 )
+#else
+#define DEV if( 0 )
+#endif
+
 #define DEBUGGING if( 0 )
 
     extern unsigned occasion;