[meson] Abort if GDI/Uniscribe headers couldn't be found
diff --git a/meson.build b/meson.build
index 610ced9..7c6e2f7 100644
--- a/meson.build
+++ b/meson.build
@@ -227,8 +227,12 @@
gdi_uniscribe_deps = []
# GDI (Uniscribe) (Windows)
if host_machine.system() == 'windows' and not get_option('gdi').disabled()
- gdi_deps_found = cpp.has_header('usp10.h') and cpp.has_header('windows.h')
+ if (get_option('directwrite').enabled() and
+ not (cpp.has_header('usp10.h') and cpp.has_header('windows.h')))
+ error('GDI/Uniscribe was enabled explicitly, but required headers are missing.')
+ endif
+ gdi_deps_found = true
foreach usplib : ['usp10', 'gdi32', 'rpcrt4']
dep = cpp.find_library(usplib, required: get_option('gdi'))
gdi_deps_found = gdi_deps_found and dep.found()
