Dear all, I try to install MonetDB with homebrew, but it failed with the error: configure: error: libxml2 library not found but required for MonetDB5 But as far as I can tell, libxml2 is already installed, e.g. $ brew list libxml2 /usr/local/Cellar/libxml2/2.9.7/bin/xml2-config /usr/local/Cellar/libxml2/2.9.7/bin/xmlcatalog /usr/local/Cellar/libxml2/2.9.7/bin/xmllint /usr/local/Cellar/libxml2/2.9.7/include/libxml2/ (47 files) /usr/local/Cellar/libxml2/2.9.7/lib/libxml2.2.dylib /usr/local/Cellar/libxml2/2.9.7/lib/cmake/libxml2/libxml2-config.cmake /usr/local/Cellar/libxml2/2.9.7/lib/pkgconfig/libxml-2.0.pc /usr/local/Cellar/libxml2/2.9.7/lib/python2.7/ (6 files) /usr/local/Cellar/libxml2/2.9.7/lib/ (3 other files) /usr/local/Cellar/libxml2/2.9.7/share/aclocal/libxml.m4 /usr/local/Cellar/libxml2/2.9.7/share/doc/ (153 files) /usr/local/Cellar/libxml2/2.9.7/share/gtk-doc/ (55 files) /usr/local/Cellar/libxml2/2.9.7/share/man/ (4 files) $ brew install libxml2 Warning: libxml2-2.9.7 already installed Is there anything I can do to fix this? Thanks a lot in advance! Jennie =============== Complete output of “brew install monetdb” =============== $ brew install monetdb Warning: You are using macOS 10.13. We do not provide support for this pre-release version. You may encounter build failures or other breakages. Please create pull-requests instead of filing issues. ==> Using the sandbox ==> Downloading https://www.monetdb.org/downloads/sources/Jul2017-SP3/MonetDB-11.27.11.tar.x... Already downloaded: /Users/jennie/Library/Caches/Homebrew/monetdb-11.27.11.tar.xz ==> ./configure --prefix=/usr/local/Cellar/monetdb/11.27.11 --enable-debug=no --enable-assert=no --enable-optimi Last 15 lines from /Users/jennie/Library/Logs/Homebrew/monetdb/01.configure: checking how to link with libiconv... -liconv checking for iconv declaration... extern size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft); checking for library containing uuid_generate... none required checking for CC_MD5_Update... yes checking for CC_RIPEMD160_Update... no checking for CC_SHA1_Update... yes checking for CC_SHA224_Update... yes checking for CC_SHA256_Update... yes checking for CC_SHA384_Update... yes checking for CC_SHA512_Update... yes checking for pcre... yes checking whether pcre comes with UTF-8 support... yes checking for libxml2... no configure: error: libxml2 library not found but required for MonetDB5 READ THIS: https://git.io/brew-troubleshooting If reporting this issue please do so at (not Homebrew/brew): https://github.com/Homebrew/homebrew-core/issues Warning: You are using macOS 10.13. We do not provide support for this pre-release version. You may encounter build failures or other breakages. Please create pull-requests instead of filing issues.