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-rw-r--r--docs/FAQ.md2
1 files changed, 2 insertions, 0 deletions
diff --git a/docs/FAQ.md b/docs/FAQ.md
index 5dafaac19..23f53d54c 100644
--- a/docs/FAQ.md
+++ b/docs/FAQ.md
@@ -89,6 +89,8 @@ following conditions:
will use a bottled version of the formula, but
`brew install <formula> --enable-bar` will trigger a source build.
* The `--build-from-source` option is invoked.
+* The environment variable `HOMEBREW_BUILD_FROM_SOURCE` is set
+(intended for developers only).
* The machine is not running a supported version of macOS as all
bottled builds are generated only for supported macOS versions.
* Homebrew is installed to a prefix other than the standard