Hi Juanito,
I also tried to use Qt-5.11.2 with TCP 11.0 (e.g. wget
http://www.tinycorelinux.net/10.x/x86/tcz/qt-5.x-<each needed component>.tcz[.dep|.md5.txt]), and with Qt-5.11.2 it start to compile.
(eventually it failed with a bunch of 'undefined reference' errors, likely due to changes in openssl. Which likely can be solved with using more packages from 10.x)
From that I would think the issue must be with Qt-5.14.0.
First few lines with Qt-5.11.2 on TCP 11.0:
DESTDIR = /tmp/ostinato/build
PREFIX = /tmp/ostinato/build/usr/local
Info: creating stash file /tmp/ostinato/source/ostinato-1.1/.qmake.stash
cd common/ && ( test -e Makefile.ostproto || /usr/local/bin/qmake -o Makefile.ostproto /tmp/ostinato/source/ostinato-1.1/common/ostproto.pro ) && make -f Makefile.ostproto
make[1]: Entering directory '/tmp/ostinato/source/ostinato-1.1/common'
protoc --cpp_out=. --proto_path=. protocol.proto
[libprotobuf WARNING google/protobuf/compiler/parser.cc:546] No syntax specified for the proto file: protocol.proto. Please use 'syntax = "proto2";' or 'syntax = "proto3";' to specify a syntax version. (Defaulted to proto2 syntax.)
g++ -c -march=i486 -mtune=i686 -pipe -isystem /usr/local/include/qt5 -std=c++11 -Os -fPIC -D_REENTRANT -Wall -W -DQT_NO_DEBUG -DQT_NETWORK_LIB -DQT_SCRIPT_LIB -DQT_XML_LIB -DQT_CORE_LIB -I. -isystem /usr/local/include/qt5 -isystem /usr/local/include/qt5/QtNetwork -isystem /usr/local/include/qt5/QtScript -isystem /usr/local/include/qt5/QtXml -isystem /usr/local/include/qt5/QtCore -I. -I/usr/local/lib/qt5/mkspecs/linux-g++ -o abstractprotocol.o abstractprotocol.cpp
Same lines with Qt-5.14.0 (on TCP 11.0):
DESTDIR = /tmp/ostinato/build
PREFIX = /tmp/ostinato/build/usr/local
Could not find qmake spec 'linux-g++'.
Error processing project file: /tmp/ostinato/source/ostinato-1.1/ost.pro
make: *** No targets specified and no makefile found. Stop.
make: *** No rule to make target 'install'. Stop.