Index: external/pdfium/pdfium-openbsd.patch
--- external/pdfium/pdfium-openbsd.patch.orig
+++ external/pdfium/pdfium-openbsd.patch
@@ -0,0 +1,22 @@
+--- core/fxge/cfx_fontmapper.cpp.orig	Fri Feb  3 17:41:17 2023
++++ core/fxge/cfx_fontmapper.cpp	Fri Feb  3 17:41:30 2023
+@@ -157,7 +157,7 @@
+     {"ForteMT", "Forte"},
+ };
+ 
+-#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || defined(OS_ASMJS)
++#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || defined(OS_ASMJS) || BUILDFLAG(IS_OPENBSD)
+ const char kNarrowFamily[] = "LiberationSansNarrow";
+ #elif BUILDFLAG(IS_ANDROID)
+ const char kNarrowFamily[] = "RobotoCondensed";
+--- core/fxge/linux/fx_linux_impl.cpp.orig	Fri Feb  3 17:41:36 2023
++++ core/fxge/linux/fx_linux_impl.cpp	Fri Feb  3 17:41:50 2023
+@@ -18,7 +18,7 @@
+ #include "third_party/base/check.h"
+ 
+ #if !BUILDFLAG(IS_LINUX) && !BUILDFLAG(IS_CHROMEOS) && !defined(OS_FUCHSIA) && \
+-    !defined(OS_ASMJS)
++    !defined(OS_ASMJS) && !BUILDFLAG(IS_OPENBSD)
+ #error "Included on the wrong platform"
+ #endif
+