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-rw-r--r--src/libmain/shared.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
index 90a4867163df..7d888202bbf1 100644
--- a/src/libmain/shared.cc
+++ b/src/libmain/shared.cc
@@ -262,6 +262,7 @@ void printVersion(const string & programName)
 void showManPage(const string & name)
 {
     restoreSignals();
+    setenv("MANPATH", settings.nixManDir.c_str(), 1);
     execlp("man", "man", name.c_str(), NULL);
     throw SysError(format("command 'man %1%' failed") % name.c_str());
 }