do not overwrite prepare if it already existed

1 files changed, 11 insertions, 5 deletions

diff --git a/core/m4/PKGBUILD b/core/m4/PKGBUILD
index ad7195a3..99059a2a 100644
--- a/core/m4/PKGBUILD
+++ b/core/m4/PKGBUILD
@@ -2,8 +2,14 @@
 source+=('m4-1.4.18-glibc-change-work-around.patch')
 md5sums+=('01968e8f3a5be62de1c849668db8042b')
 
-prepare() {
-  cd $pkgname-$pkgver
-  patch -p1 -i "$srcdir/m4-1.4.18-glibc-change-work-around.patch"
-  echo "#define _IO_IN_BACKUP 0x100" >> lib/stdio-impl.h
-}
+eval "$(
+  {
+    declare -f prepare || \
+    printf 'prepare() {\n}\n'
+  } \
+  | sed '
+    $i cd $pkgname-$pkgver \
+       patch -p1 -i "$srcdir/m4-1.4.18-glibc-change-work-around.patch" \
+       echo "#define _IO_IN_BACKUP 0x100" >> lib/stdio-impl.h
+  '
+)"