diff --git a/desmume/src/frontend/posix/cli/meson.build b/desmume/src/frontend/posix/cli/meson.build
index 30143b72c..a9a4cf25d 100644
--- a/desmume/src/frontend/posix/cli/meson.build
+++ b/desmume/src/frontend/posix/cli/meson.build
@@ -9,11 +9,11 @@ cli_src = [
 ]
 
 # TODO: why do we have to redeclare it here with one more fs level?
-includes = [
+includes = include_directories(
   '../../../../src',
   '../../../../src/libretro-common/include',
   '../../../../src/frontend',
-]
+)
 
 executable('desmume-cli',
   cli_src,
@@ -23,4 +23,4 @@ executable('desmume-cli',
   install: true,
 )
 
-install_data('doc/desmume-cli.1', install_dir: get_option('datadir') / 'man' / 'man1')
+install_data('doc/desmume-cli.1', install_dir: join_paths(get_option('datadir'), 'man', 'man1'))
diff --git a/desmume/src/frontend/posix/gtk-glade/meson.build b/desmume/src/frontend/posix/gtk-glade/meson.build
index 01bea16a4..305225179 100644
--- a/desmume/src/frontend/posix/gtk-glade/meson.build
+++ b/desmume/src/frontend/posix/gtk-glade/meson.build
@@ -25,11 +25,11 @@ desmume_src = [
 ]
 
 # TODO: why do we have to redeclare it here with one more fs level?
-includes = [
+includes = include_directories(
   '../../../../src',
   '../../../../src/libretro-common/include',
   '../../../../src/frontend',
-]
+)
 
 executable('desmume-glade',
   desmume_src,
@@ -40,7 +40,7 @@ executable('desmume-glade',
   install: true,
 )
 
-install_data('desmume-glade.desktop', install_dir: get_option('datadir') / 'applications')
-install_data('glade/DeSmuME.xpm', install_dir: get_option('datadir') / 'pixmaps')
-install_data('doc/desmume-glade.1', install_dir: get_option('datadir') / 'man' / 'man1')
-install_data(['glade/DeSmuMe_Dtools.glade', 'glade/DeSmuMe.glade', 'glade/DeSmuME.xpm'], install_dir: get_option('datadir') / 'glade')
+install_data('desmume-glade.desktop', install_dir: join_paths(get_option('datadir'), 'applications'))
+install_data('glade/DeSmuME.xpm', install_dir: join_paths(get_option('datadir'), 'pixmaps'))
+install_data('doc/desmume-glade.1', install_dir: join_paths(get_option('datadir'), 'man', 'man1'))
+install_data(['glade/DeSmuMe_Dtools.glade', 'glade/DeSmuMe.glade', 'glade/DeSmuME.xpm'], install_dir: join_paths(get_option('datadir'), 'glade'))
diff --git a/desmume/src/frontend/posix/gtk/meson.build b/desmume/src/frontend/posix/gtk/meson.build
index d1bdd9f4d..31ceab3a0 100644
--- a/desmume/src/frontend/posix/gtk/meson.build
+++ b/desmume/src/frontend/posix/gtk/meson.build
@@ -20,11 +20,11 @@ desmume_src = [
 ]
 
 # TODO: why do we have to redeclare it here with one more fs level?
-includes = [
+includes = include_directories(
   '../../../../src',
   '../../../../src/libretro-common/include',
   '../../../../src/frontend',
-]
+)
 
 executable('desmume',
   desmume_src,
@@ -35,6 +35,6 @@ executable('desmume',
   install: true,
 )
 
-install_data('desmume.desktop', install_dir: get_option('datadir') / 'applications')
-install_data('DeSmuME.svg', install_dir: get_option('datadir') / 'pixmaps')
-install_data('doc/desmume.1', install_dir: get_option('datadir') / 'man' / 'man1')
+install_data('desmume.desktop', install_dir: join_paths(get_option('datadir'), 'applications'))
+install_data('DeSmuME.svg', install_dir: join_paths(get_option('datadir'), 'pixmaps'))
+install_data('doc/desmume.1', install_dir: join_paths(get_option('datadir'), 'man', 'man1'))
diff --git a/desmume/src/frontend/posix/meson.build b/desmume/src/frontend/posix/meson.build
index b69bb3d7f..0228877f6 100644
--- a/desmume/src/frontend/posix/meson.build
+++ b/desmume/src/frontend/posix/meson.build
@@ -1,9 +1,9 @@
 project('desmume',
   ['c', 'cpp'],
   version: '2.7.10',
-  meson_version: '>=0.53',
+  meson_version: '>=0.45',
   default_options: [
-    'warning_level=0',
+    'warning_level=1',
     'c_std=c11',
     'cpp_std=c++14',
   ],
@@ -42,11 +42,11 @@ else
   have_jit = false
 endif
 
-includes = [
+includes = include_directories(
   '../../../src',
   '../../../src/libretro-common/include',
   '../../../src/frontend',
-]
+)
 
 libdesmume_src = [
   '../../armcpu.cpp',