经过一轮的google和百度，最后还是安装php7.4失败。其他的1G内存的VPS倒是可以，反而2G的VPS失败。无语了。
但是真心不建议1G内存的VPS使用PHP7.4，内存会很紧张，而且真的很卡，一不小心，数据库还直接挂起。
checking for libsodium >= 1.0.8… no
configure: error: Package requirements (libsodium >= 1.0.8) were not met:
No package 'libsodium' found
Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.
Alternatively, you may set the environment variables LIBSODIUM_CFLAGS
and LIBSODIUM_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.
make: *** No targets specified and no makefile found. Stop.
make: *** No rule to make target `install'. Stop.
1、下载并解压
wget https://download.libsodium.org/libsodium/releases/libsodium-1.0.18-stable.tar.gz tar -zxf libsodium-1.0.18-stable.tar.gz cd libsodium-stable wget https://download.libsodium.org/libsodium/releases/LATEST.tar.gz tar -zxf LATEST.tar.gz cd libsodium-stable
2、编译安装
./configure --prefix=/usr make && make check sudo make install sudo ldconfig
写在最后，更新PHP7.4，主题不一定会兼容，而且很吃内存，建议2G内存才使用PHP7.4。