README claims qt5-5.3.x and py-qt5-5.3.x are needed, pkgsrc contains 5.2.x.

ebook-viewer dumps core for me:

#0  0x00007f7fe3dcfca0 in JSC::Yarr::checkSyntax(WTF::String const&) () from /usr/pkg/qt5/lib/libQt5Qml.so.5
#1  0x00007f7fd9c89d5c in JSC::SyntaxChecker::Expression JSC::Parser<JSC::Lexer<unsigned short> >::parseMemberExpression<JSC::SyntaxChecker>(JSC::SyntaxChecker&) () from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#2  0x00007f7fd9c8ceba in JSC::SyntaxChecker::Expression JSC::Parser<JSC::Lexer<unsigned short> >::parseAssignmentExpression<JSC::SyntaxChecker>(JSC::SyntaxChecker&) ()
   from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#3  0x00007f7fd9c8949b in JSC::SyntaxChecker::Expression JSC::Parser<JSC::Lexer<unsigned short> >::parseMemberExpression<JSC::SyntaxChecker>(JSC::SyntaxChecker&) () from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#4  0x00007f7fd9c8d8c8 in JSC::SyntaxChecker::Expression JSC::Parser<JSC::Lexer<unsigned short> >::parseAssignmentExpression<JSC::SyntaxChecker>(JSC::SyntaxChecker&) ()
   from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#5  0x00007f7fd9c8ec86 in JSC::SyntaxChecker::Expression JSC::Parser<JSC::Lexer<unsigned short> >::parseExpression<JSC::SyntaxChecker>(JSC::SyntaxChecker&) () from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#6  0x00007f7fd9ca7963 in JSC::SyntaxChecker::Statement JSC::Parser<JSC::Lexer<unsigned short> >::parseExpressionOrLabelStatement<JSC::SyntaxChecker>(JSC::SyntaxChecker&) ()
   from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#7  0x00007f7fd9c8fb4c in JSC::SyntaxChecker::Statement JSC::Parser<JSC::Lexer<unsigned short> >::parseStatement<JSC::SyntaxChecker>(JSC::SyntaxChecker&, JSC::Identifier const*&, unsigned int*) ()
   from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#8  0x00007f7fd9ca52b7 in JSC::SyntaxChecker::SourceElements JSC::Parser<JSC::Lexer<unsigned short> >::parseSourceElements<(JSC::SourceElementsMode)1, JSC::SyntaxChecker>(JSC::SyntaxChecker&) ()
   from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#9  0x00007f7fd9c8fb0e in JSC::SyntaxChecker::Statement JSC::Parser<JSC::Lexer<unsigned short> >::parseStatement<JSC::SyntaxChecker>(JSC::SyntaxChecker&, JSC::Identifier const*&, unsigned int*) ()
   from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#10 0x00007f7fd9c8f802 in JSC::SyntaxChecker::Statement JSC::Parser<JSC::Lexer<unsigned short> >::parseForStatement<JSC::SyntaxChecker>(JSC::SyntaxChecker&) () from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#11 0x00007f7fd9c8fce5 in JSC::SyntaxChecker::Statement JSC::Parser<JSC::Lexer<unsigned short> >::parseStatement<JSC::SyntaxChecker>(JSC::SyntaxChecker&, JSC::Identifier const*&, unsigned int*) ()
   from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#12 0x00007f7fd9c8ffcf in JSC::SyntaxChecker::SourceElements JSC::Parser<JSC::Lexer<unsigned short> >::parseSourceElements<(JSC::SourceElementsMode)0, JSC::SyntaxChecker>(JSC::SyntaxChecker&) ()
   from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#13 0x00007f7fd9ca4cb2 in bool JSC::Parser<JSC::Lexer<unsigned short> >::parseFunctionInfo<(JSC::FunctionRequirements)0, false, JSC::SyntaxChecker>(JSC::SyntaxChecker&, JSC::Identifier const*&, JSC::SyntaxChecker::FormalParameterList&, JSC::SyntaxChecker::FunctionBody&, unsigned int&, unsigned int&, int&, unsigned int&) () from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#14 0x00007f7fd9c88f18 in JSC::SyntaxChecker::Expression JSC::Parser<JSC::Lexer<unsigned short> >::parseMemberExpression<JSC::SyntaxChecker>(JSC::SyntaxChecker&) () from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#15 0x00007f7fd9c8ceba in JSC::SyntaxChecker::Expression JSC::Parser<JSC::Lexer<unsigned short> >::parseAssignmentExpression<JSC::SyntaxChecker>(JSC::SyntaxChecker&) ()
   from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#16 0x00007f7fd9c8e542 in JSC::SyntaxChecker::Statement JSC::Parser<JSC::Lexer<unsigned short> >::parseVarDeclaration<JSC::SyntaxChecker>(JSC::SyntaxChecker&) () from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#17 0x00007f7fd9c8fcd5 in JSC::SyntaxChecker::Statement JSC::Parser<JSC::Lexer<unsigned short> >::parseStatement<JSC::SyntaxChecker>(JSC::SyntaxChecker&, JSC::Identifier const*&, unsigned int*) ()
   from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#18 0x00007f7fd9c8ffcf in JSC::SyntaxChecker::SourceElements JSC::Parser<JSC::Lexer<unsigned short> >::parseSourceElements<(JSC::SourceElementsMode)0, JSC::SyntaxChecker>(JSC::SyntaxChecker&) ()
   from /usr/pkg/qt5/lib/libJavaScriptCore.so.1
#19 0x00007f7fd9c91c5d in bool JSC::Parser<JSC::Lexer<unsigned short> >::parseFunctionInfo<(JSC::FunctionRequirements)0, false, JSC::ASTBuilder>(JSC::ASTBuilder&, JSC::Identifier const*&, JSC::ASTBuilder::FormalParameterList&, JSC::ASTBuilder::FunctionBody&, unsigned int&, unsigned int&, int&, unsigned int&) () from /usr/pkg/qt5/lib/libJavaScriptCore.so.1

Side effect of the above?
