unable to build pdfium

[blem]

I followed the instructions on building pdfium as listed here https://pdfium.googlesource.com/pdfium/+/chromium/3061/README.md

my args are 

is_debug = true
is_component_build = false
pdf_is_complete_lib = true     # one big .a
pdf_use_skia = true
pdf_enable_xfa = false
pdf_enable_v8 = false
use_sysroot = false
clang_use_chrome_plugins = false

However, I am getting the error below. Am I missing something?

gen/build/modules/linux-x64/module.modulemap:31:12: error: header '../../../../../../../../../../../../usr/include/x86_64-linux-gnu/asm/errno.h' not found
   31 |     header "../../../../../../../../../../../../usr/include/x86_64-linux-gnu/asm/errno.h"
      |            ^
1 error generated.
[1125/3065] CXX obj/third_party/icu/icuuc_private/caniter.o
ninja: build stopped: subcommand failed.

B.