Seen when using a fresh CI environment with only libxml2-devel added by cygwin setup on running a configure script:
configure:14477: checking for pkg-config configure:14495: found /usr/bin/pkg-config configure:14507: result: /usr/bin/pkg-config configure:14532: checking pkg-config is at least version 0.9.0 configure:14535: result: yes configure:14833: checking for libxml-2.0 configure:14840: $PKG_CONFIG --exists --print-errors "libxml-2.0" configure:14843: $? = 0 configure:14857: $PKG_CONFIG --exists --print-errors "libxml-2.0" configure:14860: $? = 0 configure:14992: result: yes configure:15007: checking libxml/xmlversion.h usability configure:15007: gcc -c -O2 -I/usr/include/libxml2 conftest.c >&5 configure:15007: $? = 0 configure:15007: result: yes configure:15007: checking libxml/xmlversion.h presence configure:15007: gcc -E -I/usr/include/libxml2 conftest.c configure:15007: $? = 0 configure:15007: result: yes configure:15007: checking for libxml/xmlversion.h configure:15007: result: yes configure:15013: checking for LIBXML_WRITER_ENABLED defined in libxml/xmlwriter.h configure:15036: gcc -c -O2 -I/usr/include/libxml2 conftest.c >&5 In file included from /usr/include/libxml2/libxml/parser.h:810:0, from /usr/include/libxml2/libxml/globals.h:18, from /usr/include/libxml2/libxml/xmlIO.h:117, from /usr/include/libxml2/libxml/xmlwriter.h:18, from conftest.c:69: /usr/include/libxml2/libxml/encoding.h:28:10: fatal error: iconv.h: No such file or directory #include <iconv.h> ^~~~~~~~~ As libxml2-devel provides a header that has a hard dependency on iconv.h it should also include a dependency libiconv-devel in its "requires" attribute of the package-version-release.hint (I did not found the actual hint file when looking at the package list[1]) and likely also include the necessary options in the shipped pkg-config file. 1: https://cygwin.com/packages/package_list.html -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple