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-rw-r--r--Build/source/texk/web2c/ptexdir/am/ptex.am5
1 files changed, 3 insertions, 2 deletions
diff --git a/Build/source/texk/web2c/ptexdir/am/ptex.am b/Build/source/texk/web2c/ptexdir/am/ptex.am
index efb62833deb..265e07dec17 100644
--- a/Build/source/texk/web2c/ptexdir/am/ptex.am
+++ b/Build/source/texk/web2c/ptexdir/am/ptex.am
@@ -78,10 +78,11 @@ ptex-tangle: tangle$(EXEEXT) ptex.web ptex.ch tangle-sh
@$(texmf_tangle) ptex ptex
# Extract ptex version
-ptexdir/ptex_version.h: ptexdir/ptex-base.ch
- $(AM_V_at)$(MKDIR_P) ptexdir
+$(srcdir)/ptexdir/ptex_version.h: ptexdir/ptex-base.ch
+if MAINTAINER_MODE
$(AM_V_GEN)grep '^@d pTeX_version_string==' $(srcdir)/ptexdir/ptex-base.ch \
| sed "s/^.*'-/#define PTEX_VERSION \"/;s/'.*$$/\"/" >$@
+endif MAINTAINER_MODE
# Generate ptex.web
ptex.web: tie$(EXEEXT) $(ptex_web_srcs)