Build error with qssl [-fpermissive]

build fails on both openSUSE 13.2 and Factory:

[ 564s] In file included from ssl/qsslsocket_openssl_symbols.cpp:51:0:
[ 564s] ssl/qsslsocket_openssl_symbols.cpp: In function 'DH* q_d2i_DHparams(DH*, unsigned char*, long int)':
[ 564s] ssl/qsslsocket_openssl_symbols_p.h:185:58: error: invalid conversion from 'unsigned char*' to 'const unsigned char*' [-fpermissive]
[ 564s] ret q_##func(arg1, arg2, arg3)

[ 564s] ^
[ 564s] ssl/qsslsocket_openssl_symbols.cpp:402:1: note: in expansion of macro 'DEFINEFUNC3'
[ 564s] DEFINEFUNC3(DH , d2i_DHparams, DH*a, a, unsigned char **pp, pp, long length, length, return 0, return);
[ 564s] ^
[ 564s] In file included from /usr/include/openssl/dsa.h:83:0,
[ 564s] from /usr/include/openssl/x509.h:99,
[ 564s] from /usr/include/openssl/ssl.h:156,
[ 564s] from ../../include/QtNetwork/5.5.0/QtNetwork/private/../../../../../src/network/ssl/qsslcontext_openssl_p.h:53,
[ 564s] from ../../include/QtNetwork/5.5.0/QtNetwork/private/qsslcontext_openssl_p.h:1,
[ 564s] from ssl/qsslsocket_p.h:55,
[ 564s] from ssl/qsslsocket_openssl_p.h:63,
[ 564s] from ssl/qsslsocket_openssl_symbols_p.h:64,
[ 564s] from ssl/qsslsocket_openssl_symbols.cpp:51:
[ 564s] /usr/include/openssl/dh.h:216:6: error: initializing argument 2 of 'DH* d2i_DHparams(DH*, const unsigned char*, long int)' [-fpermissive]
[ 564s] DH * d2i_DHparams(DH **a,const unsigned char **pp, long length);
[ 564s] ^