/Users/katherinewalker/drivers/driver-mongo-php/src/BSON/ObjectId.c:372:15: error: address of array 'intern->oid' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]
        if (!intern->oid) {
            ~~~~~~~~~^~~

Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 8.1.0 (clang-802.0.42)
Target: x86_64-apple-darwin16.6.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

mongodb was configured with the following options:

Build configuration:
  CFLAGS                                           : -g -O2
  Extra CFLAGS                                     : -g -O0 -Wall -D_THREAD_SAFE -pthread
  Developers flags (slow)                          :  -Wmissing-format-attribute -Wduplicate-enum -Wheader-guard -Wlogical-not-parentheses -fno-omit-frame-pointer -fno-optimize-sibling-calls -Wlogical-op-parentheses -Wbool-conversion -Wloop-analysis -Wsizeof-array-argument -Wstring-conversion -Wno-variadic-macros -Wno-sign-compare -fstack-protector -fno-exceptions -Wformat-security -Wformat-nonliteral -Winit-self -Wwrite-strings -Wenum-compare -Wempty-body -Wparentheses -Wdeclaration-after-statement -Werror -Wextra -Wno-unused-parameter -Wno-missing-field-initializers
  Code Coverage flags (extra slow)                 :
  System mongoc                                    : no
  System libbson                                   : no
  LDFLAGS                                          :
  EXTRA_LDFLAGS                                    :
  MONGODB_SHARED_LIBADD                            : -lsasl2 -Wl,-rpath,/usr/local/opt/openssl//lib -L/usr/local/opt/openssl//lib -lcrypto -lssl -lcrypto