From https://github.com/EttusResearch/uhd/issues/921

Fixes installation of Man pages

--- host/docs/CMakeLists.txt.orig	2026-05-14 12:56:32.758885886 +0000
+++ host/docs/CMakeLists.txt
@@ -89,8 +89,12 @@ if(ENABLE_MAN_PAGES)
         UHD_INSTALL(FILES ${man_page_gz_files} DESTINATION ${PKG_MAN_DIR} COMPONENT manpages)
         add_custom_target(man_page_gzips ALL DEPENDS ${man_page_gz_files})
     else(ENABLE_MAN_PAGE_COMPRESSION)
+        foreach(manfile ${man_page_sources})
+            set(manfile "${CMAKE_CURRENT_SOURCE_DIR}/manpages/${manfile}")
+            list(APPEND man_page_files ${manfile})
+        endforeach(manfile ${man_page_sources})
         # uncompressed man pages; just install them
-        UHD_INSTALL(FILES ${man_page_sources} DESTINATION ${PKG_MAN_DIR} COMPONENT manpages)
+        UHD_INSTALL(FILES ${man_page_files} DESTINATION ${PKG_MAN_DIR} COMPONENT manpages)
     endif(ENABLE_MAN_PAGE_COMPRESSION)
 endif(ENABLE_MAN_PAGES)