[FFmpeg-cvslog] doc/general: update avisynth docs with a way to install just the headers using CMake

[Stephen Hutchinson]

ffmpeg | branch: master | Stephen Hutchinson <qyot27 at gmail.com> | Sun Apr  5 11:37:43 2020 +0200| [7b0f7a7f3b6bf09c076c23d0701bf42a2c997ca2] | committer: Marton Balint

doc/general: update avisynth docs with a way to install just the headers using CMake

Signed-off-by: Marton Balint <cus at passwd.hu>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7b0f7a7f3b6bf09c076c23d0701bf42a2c997ca2
---

 doc/general.texi | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/doc/general.texi b/doc/general.texi
index a7c4b22461..4adcc9e742 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -52,8 +52,9 @@ This driver can be installed using amdgpu-pro-install script in official amd dri
 FFmpeg can read AviSynth scripts as input. To enable support, pass
 @code{--enable-avisynth} to configure after installing the headers
 provided by @url{https://github.com/AviSynth/AviSynthPlus, AviSynth+}.
-AviSynth+ supplies a @code{GNUmakefile} to install only the headers,
-as CMake does not make header-only installs an easy task.
+AviSynth+ can be configured to install only the headers by either
+passing @code{-DHEADERS_ONLY:bool=on} to the normal CMake-based build
+system, or by using the supplied @code{GNUmakefile}.
 
 For Windows, supported AviSynth variants are
 @url{http://avisynth.nl, AviSynth 2.6 RC1 or higher} for 32-bit builds and