should compile on netbsd

lib/pure/os.nim

@@ -1586,7 +1586,7 @@ proc getAppFilename*(): string {.rtl, extern: "nos$1", tags: [FReadIO].} =
     # little heuristic that may work on other POSIX-like systems:
     result = string(getEnv("_"))
     if len(result) == 0:
-      result = string(ParamStr(0))
+      result = string(paramStr(0))
       # POSIX guaranties that this contains the executable
       # as it has been executed by the calling process
       if len(result) > 0 and result[0] != DirSep: # not an absolute path?

lib/pure/osproc.nim

@@ -660,8 +660,8 @@ elif not defined(useNimRtl):
 
     else:
     
-      Pid = fork()
-      if Pid < 0: osError(osLastError())
+      pid = fork()
+      if pid < 0: osError(osLastError())
       if pid == 0:
         ## child process:
 
@@ -685,14 +685,14 @@ elif not defined(useNimRtl):
           if env == nil:
             discard execv(command, a)
           else:
-            discard execve(command, a, ToCStringArray(env))
+            discard execve(command, a, toCStringArray(env))
         else:
           var x = addCmdArgs(command, args)
           var a = toCStringArray(["sh", "-c"], [x])
           if env == nil:
             discard execv("/bin/sh", a)
           else:
-            discard execve("/bin/sh", a, ToCStringArray(env))
+            discard execve("/bin/sh", a, toCStringArray(env))
         # too risky to raise an exception here:
         quit("execve call failed: " & $strerror(errno))
     # Parent process. Copy process information.

lib/pure/sockets.nim

@@ -192,7 +192,7 @@ when defined(Posix):
     of AF_UNIX:        result = posix.AF_UNIX
     of AF_INET:        result = posix.AF_INET
     of AF_INET6:       result = posix.AF_INET6
-    else: nil
+    else: discard
 
   proc toInt(typ: TType): cint =
     case typ
@@ -200,7 +200,7 @@ when defined(Posix):
     of SOCK_DGRAM:     result = posix.SOCK_DGRAM
     of SOCK_SEQPACKET: result = posix.SOCK_SEQPACKET
     of SOCK_RAW:       result = posix.SOCK_RAW
-    else: nil
+    else: discard
 
   proc toInt(p: TProtocol): cint =
     case p
@@ -210,7 +210,7 @@ when defined(Posix):
     of IPPROTO_IPV6:   result = posix.IPPROTO_IPV6
     of IPPROTO_RAW:    result = posix.IPPROTO_RAW
     of IPPROTO_ICMP:   result = posix.IPPROTO_ICMP
-    else: nil
+    else: discard
 
 else:
   proc toInt(domain: TDomain): cint =