Add configure check for sapi.h

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

configure.ac

@@ -3250,6 +3250,14 @@ AM_CONDITIONAL([HAVE_FONTCONFIG], [test "${have_fontconfig}" = "yes"])
 AM_CONDITIONAL([HAVE_FRIBIDI], [test "${have_fribidi}" = "yes"])
 AM_CONDITIONAL([HAVE_HARFBUZZ], [test "${have_harfbuzz}" = "yes"])
 
+dnl
+dnl SAPI (text to Speech renderer for Windows)
+dnl
+AC_CHECK_HEADERS(sapi.h, [
+              have_sapi="yes"
+            ],[AC_MSG_WARN([sapi.h not found. Text to Speech renderer for Windows disabled])])
+
+AM_CONDITIONAL([HAVE_SAPI], [test "${have_sapi}" = "yes"])
 
 dnl
 dnl  QuartzText vout module (iOS/Mac OS)

modules/text_renderer/Makefile.am

@@ -42,11 +42,13 @@ libnsspeechsynthesizer_plugin_la_LDFLAGS = -Wl,-framework,Cocoa
 text_LTLIBRARIES += libnsspeechsynthesizer_plugin.la
 endif
 
+if HAVE_SAPI
 libsapi_plugin_la_SOURCES = text_renderer/sapi.cpp
 libsapi_plugin_la_LIBADD = -lole32
 if HAVE_WIN32
 text_LTLIBRARIES += libsapi_plugin.la
 endif
+endif
 
 libsvg_plugin_la_SOURCES = text_renderer/svg.c
 libsvg_plugin_la_CPPFLAGS = $(AM_CPPFLAGS) $(SVG_CFLAGS)