Note the form of jhc --version output

3c9eccfa · Duncan Coutts · a42f06cc · 3c9eccfa
Commit 3c9eccfa authored Feb 11, 2008 by Duncan Coutts
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Distribution/Simple/Program.hs Distribution/Simple/Program.hs +3 -0

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--- a/Distribution/Simple/Program.hs
+++ b/Distribution/Simple/Program.hs
@@ -512,6 +512,9 @@ hmakeProgram = (simpleProgram "hmake") {
 jhcProgram :: Program
 jhcProgram = (simpleProgram "jhc") {
    programFindVersion = findProgramVersion "--version" $ \str ->
+    -- invoking "jhc --version" gives a string like
+    -- "jhc 0.3.20080208 (wubgipkamcep-2)
+    -- compiled by ghc-6.8 on a x86_64 running linux"
      case words str of
        (_:ver:_) -> ver
        _         -> ""