--- www/chromium/Makefile	2021-07-18 19:51:19.236620000 +0900
+++ www/chromium/Makefile	2021-08-04 22:50:00.672994000 +0900
@@ -201,6 +201,11 @@ TEST_ALL_TARGET=	${TEST_TARGETS}
 .include <bsd.port.options.mk>
 .include <bsd.port.pre.mk>
 
+BASE_MEMPCPY!=	grep mempcpy ${CROSS_SYSROOT}/usr/include/string.h
+.if empty(BASE_MEMPCPY)
+EXTRA_PATCHES+=	${PATCHDIR}/extra-patch-no-mempcpy-nasm
+.endif
+
 .if ${PORT_OPTIONS:MHEIMDAL_BASE} && !exists(/usr/lib/libkrb5.so)
 IGNORE=		you have selected HEIMDAL_BASE but do not have Heimdal installed in base
 .endif

--- /dev/null
+++ www/chromium/files/extra-patch-no-mempcpy-nasm	2021-07-31 21:32:15.542747000 +0900
@@ -0,0 +1,11 @@
+--- third_party/nasm/config/config-linux.h.orig	2021-04-14 18:43:05 UTC
++++ third_party/nasm/config/config-linux.h
+@@ -336,7 +336,7 @@
+ #define HAVE_MEMORY_H 1
+ 
+ /* Define to 1 if you have the `mempcpy' function. */
+-#define HAVE_MEMPCPY 1
++/* #undef HAVE_MEMPCPY */
+ 
+ /* Define to 1 if you have a working `mmap' system call. */
+ #define HAVE_MMAP 1
--- www/chromium/files/patch-third__party_nasm_config_config-linux.h.orig	2021-08-01 08:43:06.762442000 +0900
+++ www/chromium/files/patch-third__party_nasm_config_config-linux.h	2021-08-06 08:43:06.762442000 +0900
@@ -18,15 +18,6 @@
  
  /* Define to 1 if you have the `faccessat' function. */
  #define HAVE_FACCESSAT 1
-@@ -336,7 +336,7 @@
- #define HAVE_MEMORY_H 1
- 
- /* Define to 1 if you have the `mempcpy' function. */
--#define HAVE_MEMPCPY 1
-+/* #undef HAVE_MEMPCPY */
- 
- /* Define to 1 if you have a working `mmap' system call. */
- #define HAVE_MMAP 1
 @@ -411,7 +411,7 @@
  #define HAVE_SYSCONF 1