我打算从源代码编译 Firefox。为此，我确实需要编译 GTK。为此，我确实需要编译 Cairo。
解决了 Cairo 的一些依赖关系后，我能够运行配置脚本。如下，结果：
cairo (version 1.10.2 [release]) will be compiled with:
The following surface backends:
Image: yes (always builtin)
Recording: yes (always builtin)
Tee: no (disabled, use --enable-tee to enable)
XML: no (disabled, use --enable-xml to enable)
Skia: no (disabled, use --enable-skia to enable)
Xlib: yes
Xlib Xrender: no (requires http://freedesktop.org/Software/xlibs)
Qt: no (disabled, use --enable-qt to enable)
Quartz: no (requires CoreGraphics framework)
Quartz-image: no (disabled, use --enable-quartz-image to enable)
XCB: no (disabled, use --enable-xcb to enable)
Win32: no (requires a Win32 platform)
OS2: no (disabled, use --enable-os2 to enable)
CairoScript: no (disabled, use --enable-script to enable)
PostScript: yes
PDF: yes
SVG: yes
OpenGL: no (disabled, use --enable-gl to enable)
BeOS: no (disabled, use --enable-beos to enable)
DirectFB: no (disabled, use --enable-directfb to enable)
OpenVG: no (disabled, use --enable-vg to enable)
DRM: no (disabled, use --enable-drm to enable)
The following font backends:
User: yes (always builtin)
FreeType: no (freetype-config not found in path or $FREETYPE_CONFIG)
Fontconfig: no (freetype-config not found in path or $FREETYPE_CONFIG)
Win32: no (requires a Win32 platform)
Quartz: no (requires CoreGraphics framework)
The following functions:
PNG functions: yes
GLEW functions: no (not required by any backend)
GLX functions: no (not required by any backend)
WGL functions: no (not required by any backend)
EGL functions: no (not required by any backend)
X11-xcb functions: no (disabled, use --enable-xlib-xcb to enable)
XCB-drm functions: no (disabled, use --enable-xcb-drm to enable)
XCB-shm functions: no (requires --enable-xcb)
DRM-Xr functions: no (disabled, use --enable-drm-xr to enable)
The following features and utilities:
cairo-trace: yes
cairo-script-interpreter: yes
And the following internal features:
pthread: yes
gtk-doc: no
gcov support: no
symbol-lookup: no (requires bfd)
test surfaces: no (disabled, use --enable-test-surfaces to enable)
ps testing: no (requires libspectre)
pdf testing: no (requires poppler-glib >= 0.13.3)
svg testing: no (requires librsvg-2.0 >= 2.15.0)
*** No native font backends enabled for your platform. It is strongly
*** recommended that you enable the native font backend feature for your
*** platform.
我这样问主要是因为上面的警告。这些 FreeType、FontType 或 Quartz 真的有必要吗（考虑到 Firefox）？还有什么东西会很好吗？感谢您的意见。