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For the aclocal/ax_boost_base.m4 and contrib/fb303/aclocal/ax_boost_base.m4 components:

#   Copyright (c) 2007 Thomas Porschberg <******@****.***>
#
#   Copying and distribution of this file, with or without
#   modification, are permitted in any medium without royalty provided
#   the copyright notice and this notice are preserved.

@keyframes progress-bar-stripes {\n    from { background-position: $progress-height 0; }\n    to { background-position: 0 0; }\n  }\n}\n\n.progress {\n  display: flex;\n  height: $progress-height;\n  overflow: hidden; // force rounded corners by cropping it\n  line-height: 0;\n  @include font-size($progress-font-size);\n  background-color: $progress-bg;\n  @include border-radius($progress-border-radius);\n  @include box-shadow($progress-box-shadow);\n}\n\n.progress-bar {\n  display: flex;\n  flex-direction:...