* builds/unix/configure.raw: Restore `SYSTEM_ZLIB` variable.
This was accidentally removed with commit 93ebcbd0 almost eight years ago.
diff --git a/builds/unix/configure.raw b/builds/unix/configure.raw
index f326872..c5221da 100644
--- a/builds/unix/configure.raw
+++ b/builds/unix/configure.raw
@@ -317,6 +317,12 @@
AC_MSG_ERROR([external zlib support requested but library not found])
fi
+SYSTEM_ZLIB=
+if test "$have_zlib" != no; then
+ SYSTEM_ZLIB=yes
+fi
+AC_SUBST([SYSTEM_ZLIB])
+
# check for system libbz2
diff --git a/devel/ftoption.h b/devel/ftoption.h
index f92b416..a99c4c9 100644
--- a/devel/ftoption.h
+++ b/devel/ftoption.h
@@ -219,6 +219,10 @@
* If you use a build system like cmake or the `configure` script,
* options set by those programs have precedence, overwriting the value
* here with the configured one.
+ *
+ * If you use the GNU make build system directly (that is, without the
+ * `configure` script) and you define this macro, you also have to pass
+ * `SYSTEM_ZLIB=yes` as an argument to make.
*/
/* #define FT_CONFIG_OPTION_SYSTEM_ZLIB */
diff --git a/include/freetype/config/ftoption.h b/include/freetype/config/ftoption.h
index 4227fd3..487b333 100644
--- a/include/freetype/config/ftoption.h
+++ b/include/freetype/config/ftoption.h
@@ -219,6 +219,10 @@
* If you use a build system like cmake or the `configure` script,
* options set by those programs have precedence, overwriting the value
* here with the configured one.
+ *
+ * If you use the GNU make build system directly (that is, without the
+ * `configure` script) and you define this macro, you also have to pass
+ * `SYSTEM_ZLIB=yes` as an argument to make.
*/
/* #define FT_CONFIG_OPTION_SYSTEM_ZLIB */
