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-rw-r--r--src/libmain/shared.cc1
-rw-r--r--src/libstore/globals.cc1
-rw-r--r--src/libstore/globals.hh3
-rw-r--r--src/libstore/local.mk1
4 files changed, 6 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());
 }
diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
index c6b508cbe82f..247040606fb7 100644
--- a/src/libstore/globals.cc
+++ b/src/libstore/globals.cc
@@ -38,6 +38,7 @@ Settings::Settings()
     , nixConfDir(canonPath(getEnv("NIX_CONF_DIR", NIX_CONF_DIR)))
     , nixLibexecDir(canonPath(getEnv("NIX_LIBEXEC_DIR", NIX_LIBEXEC_DIR)))
     , nixBinDir(canonPath(getEnv("NIX_BIN_DIR", NIX_BIN_DIR)))
+    , nixManDir(canonPath(NIX_MAN_DIR))
     , nixDaemonSocketFile(canonPath(nixStateDir + DEFAULT_SOCKET_PATH))
 {
     buildUsersGroup = getuid() == 0 ? "nixbld" : "";
diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index 508084d08acb..fd3fbec9f017 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -82,6 +82,9 @@ public:
     /* The directory where the main programs are stored. */
     Path nixBinDir;
 
+    /* The directory where the man pages are stored. */
+    Path nixManDir;
+
     /* File name of the socket the daemon listens to.  */
     Path nixDaemonSocketFile;
 
diff --git a/src/libstore/local.mk b/src/libstore/local.mk
index 239356aee8dc..c7ac534e2383 100644
--- a/src/libstore/local.mk
+++ b/src/libstore/local.mk
@@ -38,6 +38,7 @@ libstore_CXXFLAGS = \
  -DNIX_CONF_DIR=\"$(sysconfdir)/nix\" \
  -DNIX_LIBEXEC_DIR=\"$(libexecdir)\" \
  -DNIX_BIN_DIR=\"$(bindir)\" \
+ -DNIX_MAN_DIR=\"$(mandir)\" \
  -DSANDBOX_SHELL="\"$(sandbox_shell)\"" \
  -DLSOF=\"$(lsof)\"