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The include-what-you-use (IWYU) policy is beneficial to faster compilation and fewer recompilations. Many build tools, such as GNU make, provide a mechanism for automatically figuring out what .h files a .cc file depends on. These mechanisms typically look at #include lines. When unnecessary #includes are listed, the build system is more likely to recompile in cases where it is not necessary. With the enforcement, header file <include/mimalloc.h> no longer includes <stdlib.h>. Reference: https://github.com/include-what-you-use/include-what-you-use/blob/master/docs/WhyIWYU.md