[freetype2] master c6345ca: * meson.build: Fix 'png' build option (#59458).

[Werner LEMBERG]

branch: master
commit c6345ca36de9d396b4dbef2aeab73a5a838c46b6
Author: Torsten Hilbrich <emacs.nolkaf@hilbrich.tk>
Commit: Werner Lemberg <wl@gnu.org>

    * meson.build: Fix 'png' build option (#59458).
    
    Without this patch, 'png' is always required.
---
 ChangeLog   | 6 ++++++
 meson.build | 6 ++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 90c97e5..1354513 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2021-01-06  Torsten Hilbrich  <emacs.nolkaf@hilbrich.tk>
+
+       * meson.build: Fix 'png' build option (#59458).
+
+       Without this patch, 'png' is always required.
+
 2021-01-04  Alexei Podtelezhnikov  <apodtele@gmail.com>
 
        [builds/windows] Add SDF to VC2010 project.
diff --git a/meson.build b/meson.build
index d0f5783..895ebb3 100644
--- a/meson.build
+++ b/meson.build
@@ -264,8 +264,10 @@ endif
 
 # PNG support
 libpng_dep = dependency('libpng', required: get_option('png'))
-ftoption_command += ['--enable=FT_CONFIG_OPTION_USE_PNG']
-ft2_deps += [libpng_dep]
+if libpng_dep.found()
+  ftoption_command += ['--enable=FT_CONFIG_OPTION_USE_PNG']
+  ft2_deps += [libpng_dep]
+endif
 
 # Harfbuzz support
 harfbuzz_dep = dependency('harfbuzz',