diff --git a/meson.build b/meson.build
index 6e1ca7628b..fc7e769a48 100644
--- a/meson.build
+++ b/meson.build
@@ -884,9 +884,9 @@ check_types = [
   ['clGetDeviceIDsFromD3D11KHR_fn', ['CL/cl_d3d11.h'],
     {'preconditions': ['d3d11va', 'opencl']}],
   ['struct addrinfo', ['netdb.h']],
-  ['struct group_source_req', ['netinet/in.h']],
-  ['struct ip_mreq_source', ['netinet/in.h']],
-  ['struct ipv6_mreq', ['netinet/in.h']],
+  ['struct group_source_req', ['netinet/in.h'], {'c_args': ['-D_BSD_SOURCE']}],
+  ['struct ip_mreq_source', ['netinet/in.h'], {'c_args': ['-D_BSD_SOURCE']}],
+  ['struct ipv6_mreq', ['netinet/in.h'], {'c_args': ['-D_DARWIN_C_SOURCE']}],
   ['struct pollfd', ['poll.h']],
   ['struct sctp_event_subscribe', ['netinet/sctp.h']],
   ['struct sockaddr_in6', ['netinet/in.h']],
@@ -1348,7 +1348,7 @@ conf.set('os2threads', 0)
 conf.set10('bigendian', host_machine.endian() == 'big')
 conf.set10('fast_unaligned', ['x86', 'x86_64', 'aarch', 'ppc'].contains(host_machine.cpu_family()))

-if host_machine.system() == 'linux'
+if host_machine.system() == 'linux' or host_machine.system() == 'darwin'
   conf.set10('pthreads', thread_dep.found())
   conf.set('section_data_rel_ro', 1)
 elif host_machine.system() == 'windows'
@@ -1570,6 +1570,13 @@ if host_machine.system() == 'windows'
   else
     asm_format = 'win32'
   endif
+elif host_machine.system() == 'darwin'
+  if conf.get('x86_64') == 1
+    asm_format = 'macho64'
+  else
+    asm_format = 'macho32'
+  endif
+  add_project_arguments(cc.get_supported_arguments(['-mdynamic-no-pic']), language: 'c')
 else
   if conf.get('x86_64') == 1
     asm_format = 'elf64'
@@ -1578,9 +1585,15 @@ else
   endif
 endif

+extern_prefix = cc.symbols_have_underscore_prefix() ? '_' : ''
+
 asm_args = ['-DPIC', '-g']
 asm_inc = join_paths(meson.current_source_dir(), 'libavutil/x86/')

+if extern_prefix != ''
+  asm_args += ['-DPREFIX']
+endif
+
 extern_things = [
   ['AVOutputFormat', 'muxer', 'libavformat/allformats.c', 'muxer_list'],
   ['AVInputFormat', 'demuxer', 'libavformat/allformats.c', 'demuxer_list'],
@@ -2022,7 +2035,7 @@ final_conf.set_quoted('SLIBSUF', host_machine.system() == 'windows' ? '.dll' : '
 final_conf.set('HAVE_MMX2', conf.get('mmxext'))
 final_conf.set('SWS_MAX_FILTER_SIZE', 256)
 final_conf.set('EXTERN_ASM', true)
-final_conf.set_quoted('EXTERN_PREFIX', '')
+final_conf.set_quoted('EXTERN_PREFIX', extern_prefix)

 foreach restrict_kw : ['restrict', '__restrict__', '__restrict', '']
   if not final_conf.has('av_restrict') and cc.compiles('void foo(char * @0@ p);'.format(restrict_kw))