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+Usage: build.sh [-hcv] [-cc] [-j <n>] [--nspr] [--gyp|-g] [--opt|-o] [-m32]
+                [--test] [--pprof] [--scan-build[=output]] [--ct-verif]
+                [--asan] [--ubsan] [--msan] [--sancov[=edge|bb|func|...]]
+                [--disable-tests] [--fuzz[=tls|oss]] [--system-sqlite]
+                [--no-zdefs] [--with-nspr] [--system-nspr] [--enable-libpkix]
+                [--enable-fips]
+
+This script builds NSS with gyp and ninja.
+
+This build system is still under development.  It does not yet support all
+the features or platforms that NSS supports.
+
+NSS build tool options:
+
+    -h               display this help and exit
+    -c               clean before build
+    -cc              clean without building
+    -v               verbose build
+    -j <n>           run at most <n> concurrent jobs
+    --nspr           force a rebuild of NSPR
+    --gyp|-g         force a rerun of gyp
+    --opt|-o         do an opt build
+    -m32             do a 32-bit build on a 64-bit system
+    --clang          build with clang and clang++
+    --gcc            build with gcc and g++
+    --test           ignore map files and export everything we have
+    --fuzz           build fuzzing targets (this always enables test builds)
+                     --fuzz=tls to enable TLS fuzzing mode
+                     --fuzz=oss to build for OSS-Fuzz
+    --pprof          build with gperftool support
+    --ct-verif       build with valgrind for ct-verif
+    --scan-build     run the build with scan-build (scan-build has to be in the path)
+                     --scan-build=/out/path sets the output path for scan-build
+    --asan           do an asan build
+    --ubsan          do an ubsan build
+                     --ubsan=bool,shift,... sets specific UB sanitizers
+    --msan           do an msan build
+    --sancov         do sanitize coverage builds
+                     --sancov=func sets coverage to function level for example
+    --disable-tests  don't build tests and corresponding cmdline utils
+    --system-sqlite  use system sqlite
+    --no-zdefs       don't set -Wl,-z,defs
+    --with-nspr      don't build NSPR but use the one at the given location, e.g.
+                     --with-nspr=/path/to/nspr/include:/path/to/nspr/lib
+    --system-nspr    use system nspr. This requires an installation of NSPR and
+                     might not work on all systems.
+    --enable-libpkix make libpkix part of the build.
+    --enable-fips    don't disable FIPS checks.