There is now a ( very simple) man page viewer that supports MANPATH

man-tiny/Makefile

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+# Copyright (C) 2008 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=man-tiny
+PKG_VERSION:=20110518
+PKG_REV:=4b5bd45caa1ddd157e54197578b0b4f6a17d05bb
+PKG_RELEASE:=1
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=git://projects.qi-hardware.com/man-tiny.git
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
+PKG_SOURCE_VERSION:=$(PKG_REV)
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/man-tiny
+  TITLE:=Man page viewer
+  SECTION:=utilities
+  CATEGORY:=Utilities
+  URL:=http://projects.qi-hardware.com/index.php/p/man-tiny/
+  DEPENDS:=+mandoc
+endef
+
+define Package/man-tiny/description
+  An extremely simple man page viewer that uses mandoc
+endef
+
+define Package/man-tiny/install
+	$(INSTALL_DIR) \
+		$(1)/usr/bin/
+
+	$(INSTALL_BIN) \
+		$(PKG_BUILD_DIR)/src/man \
+		$(1)/usr/bin/
+endef
+
+$(eval $(call BuildPackage,man-tiny))