is it IPC::SysV or IPC/SysV, or... ?
To disable certain extensions so that they are not built, use the
-Dnoextensions=... and -Donlyextensions=... options. They both accept
-a space-separated list of extensions. The extensions listed in
+a space-separated list of extensions, such as C<IPC/SysV>. The extensions
+listed in
C<noextensions> are removed from the list of extensions to build, while
the C<onlyextensions> is rather more severe and builds only the listed
extensions. The latter should be used with extreme caution since