--- a/doc/install.texi
+++ b/doc/install.texi
@@ -261,6 +261,11 @@
 @noindent
 and if that doesn't work, install pre-built binaries of GCC for HP-UX.
 
+HP-UX @command{make} updates targets which have the same time stamps as
+their prerequisites, which makes it generally unusable when shipped
+generated files such as @command{configure} are involved.  Use GNU
+@command{make} instead.
+
 On OSF/1 a.k.a.@: Tru64, some versions of the default C compiler cannot
 parse its @code{<wchar.h>} header file.  The option @option{-nodtk} can be
 used as a workaround.  If GNU CC is not installed, it is therefore