Comment 73 for bug 1751460

(In reply to Michael Catanzaro from comment #4)
> Jeremy, here's some debug you could try adding to
> Source/bmalloc/bmalloc/VMAllocate.h:

webkit2gtk failed to build for me with those lines.

https://launchpad.net/~jbicha/+archive/ubuntu/tempdeja/+sourcepub/8853741/+listing-archive-extra

Build log excerpt
=================

In file included from /<<PKGBUILDDIR>>/Source/bmalloc/bmalloc/SmallPage.h:32:0,
                 from /<<PKGBUILDDIR>>/Source/bmalloc/bmalloc/Deallocator.h:31,
                 from /<<PKGBUILDDIR>>/Source/bmalloc/bmalloc/Cache.h:31,
                 from /<<PKGBUILDDIR>>/Source/bmalloc/bmalloc/bmalloc.h:29,
                 from /<<PKGBUILDDIR>>/Source/bmalloc/bmalloc/BMalloced.h:28,
                 from /<<PKGBUILDDIR>>/Source/bmalloc/bmalloc/IsoHeapImpl.h:28,
                 from /<<PKGBUILDDIR>>/Source/bmalloc/bmalloc/AllIsoHeaps.h:28,
                 from /<<PKGBUILDDIR>>/Source/bmalloc/bmalloc/AllIsoHeaps.cpp:26:
/<<PKGBUILDDIR>>/Source/bmalloc/bmalloc/VMAllocate.h: In function ‘void* tryVMAllocate(size_t)’:
/<<PKGBUILDDIR>>/Source/bmalloc/bmalloc/VMAllocate.h:48:5: error: ‘vmValidate’ was not declared in this scope
     vmValidate(vmSize);
     ^~~~~~~~~~
/<<PKGBUILDDIR>>/Source/bmalloc/bmalloc/VMAllocate.h:49:85: error: ‘BMALLOC_NORESERVE’ was not declared in this scope
     void* result = mmap(0, vmSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON | BMALLOC_NORESERVE, BMALLOC_VM_TAG, 0);
                                                                                     ^~~~~~~~~~~~~~~~~
/<<PKGBUILDDIR>>/Source/bmalloc/bmalloc/VMAllocate.h:49:104: error: ‘BMALLOC_VM_TAG’ was not declared in this scope
     void* result = mmap(0, vmSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON | BMALLOC_NORESERVE, BMALLOC_VM_TAG, 0);