M-x pdf-tools-install 提示信息如下：
Makefile.am: installing './depcomp'
./configure -q --bindir=/home/mls/.emacs.d/.local/straight/build-27.1/pdf-tools/ && make -s
configure: WARNING: cache variable ac_cv_env_PKG_CONFIG_PATH_value contains a newline
config.status: error: in `/home/mls/.emacs.d/.local/straight/build-27.1/pdf-tools/build/server':
config.status: error: Something went wrong bootstrapping makefile fragments
for automatic dependency tracking. If GNU make was not used, consider
re-running the configure script with MAKE="gmake" (or whatever is
necessary). You can also try re-running configure with the
'--disable-dependency-tracking' option to at least be able to build
the package (albeit without support for automatic dependency tracking).
See `config.log' for more details
configure: WARNING: cache variable ac_cv_env_PKG_CONFIG_PATH_value contains a newline
===========================
Build failed. ;o(
===========================
Note: maybe try the '-d' option.
不知道是哪里出问题了，请教解决方法，感谢。
在 pdf-tools/server 里执行：
./autobuild -d -i ~/.emacs.d/.local/straight/repos/pdf-tools 能成功。
