Arch installation

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When I install melodic, I have a long list of undefined references - moreover, my qt5 is not found.

/usr/bin/ld: warning: libicui18n.so.62, needed by /usr/lib/libQt5Core.so.5.11.1, not found (try using -rpath or -rpath-link)
/usr/bin/ld: warning: libicuuc.so.62, needed by /usr/lib/libQt5Core.so.5.11.1, not found (try using -rpath or -rpath-link)
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `u_errorName_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucal_setMillis_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucnv_getDefaultName_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucal_open_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucal_getDSTSavings_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucnv_compareNames_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucal_getDefaultTimeZone_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucnv_close_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucol_setAttribute_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `uenum_close_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucal_inDaylightTime_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucal_openCountryTimeZones_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucnv_countAliases_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucnv_getAlias_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `uenum_next_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucal_clone_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucnv_getAvailableName_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucal_openTimeZoneIDEnumeration_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucnv_open_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucnv_countAvailable_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucnv_getStandardName_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucnv_fromUnicode_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucnv_getMaxCharSize_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `u_strToLower_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucal_close_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucal_openTimeZones_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucnv_setSubstChars_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucol_open_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucnv_toUnicode_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucal_get_62'
/usr/bin/ld: /usr/lib/libQt5Core.so.5.11.1: undefined reference to `ucol_close_62'
/usr/bin ...