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-rw-r--r--Build/source/doc/tlbuild.texi8
1 files changed, 7 insertions, 1 deletions
diff --git a/Build/source/doc/tlbuild.texi b/Build/source/doc/tlbuild.texi
index 5222f490992..f434795ed44 100644
--- a/Build/source/doc/tlbuild.texi
+++ b/Build/source/doc/tlbuild.texi
@@ -2100,10 +2100,16 @@ Another problem arises if the build process must execute some
(auxiliary or installable) programs. Auxiliary programs can be placed
into a subdirectory that is configured natively as is done for
@file{texk/web2c/web2c}, @file{texk/dvipsk/squeeze}, and
-@file{texk/xdvik/squeeze}. The module @file{libs/freetype} uses the
+@file{texk/xdvik/squeeze}. The module @file{libs/freetype2} uses the
value of @code{CC_BUILD}, @file{@var{build}-gcc}, @file{gcc}, or
@file{cc} as compiler for the auxiliary program.
+@pindex txt2zlib
+Building Lua@TeX{} (or LuaJIT@TeX{}) uses the auxiliary program
+@file{txt2zlib} to create @file{pdflua.c} and, if necessary, update the
+distributed version of that file. In a cross compilation we simply use that
+distributed file.
+
@cindex ICU cross compiling
The situation for installable programs needed by the build process is
somewhat different. A quite expensive possibility, chosen for the ICU