Index: head/math/qtiplot/files/patch-sip-4.19.6
===================================================================
--- head/math/qtiplot/files/patch-sip-4.19.6	(nonexistent)
+++ head/math/qtiplot/files/patch-sip-4.19.6	(revision 457851)
@@ -0,0 +1,48 @@
+The patch name is an approximation; something changed between SIP 4.19.2 and
+SIP 4.19.6 that causes the build to fail and sipAPI.qti.h is no longer
+generated.
+
+Obtained from: https://anonscm.debian.org/git/debian-science/packages/qtiplot.git/tree/debian/patches/20_fix_FTBFS_sip4.19.patch
+Obtained from: https://bugs.gentoo.org/641514#c2
+--- qtiplot/src/scripting/PythonScripting.cpp.orig	2018-01-02 11:37:07 UTC
++++ qtiplot/src/scripting/PythonScripting.cpp
+@@ -58,7 +58,7 @@ typedef struct _traceback {
+ #include <QMessageBox>
+ 
+ // includes sip.h, which undefines Qt's "slots" macro since SIP 4.6
+-#include "sipAPIqti.h"
++#include "sip.h"
+ extern "C" void initqti();
+ 
+ const char* PythonScripting::langName = "Python";
+@@ -359,10 +359,11 @@ bool PythonScripting::setQObject(QObject *val, const c
+ 	if(!val) return false;
+ 	PyObject *pyobj=NULL;
+ 
+-	PyGILState_STATE state = PyGILState_Ensure();
++	sipAPIDef sip_API;
+ 
+-	sipWrapperType * klass = sipFindClass(val->className());
+-	if (klass) pyobj = sipConvertFromInstance(val, klass, NULL);
++	PyGILState_STATE state = PyGILState_Ensure();
++	const auto klass = sip_API.api_find_class(val->className());
++	if (klass) pyobj = sip_API.api_convert_from_type(val, klass->wt_td, NULL);
+ 
+ 	if (pyobj) {
+ 		if (dict)
+--- qtiplot/src/scripting/qti.sip.orig	2018-01-02 11:37:07 UTC
++++ qtiplot/src/scripting/qti.sip
+@@ -3243,11 +3243,11 @@ class FFT : Filter (public)
+ %MethodCode
+   SIPQTI_APP(new sipFFT(app, a0, *a1, a2, a3))
+ %End
+-  FFT(QwtPlotCurve *&) /NoDerived/;
++  FFT(QwtPlotCurve *) /NoDerived/;
+ %MethodCode
+   SIPQTI_APP(new sipFFT(app, a0))
+ %End
+-  FFT(QwtPlotCurve *&, double, double) /NoDerived/;
++  FFT(QwtPlotCurve *, double, double) /NoDerived/;
+ %MethodCode
+   SIPQTI_APP(new sipFFT(app, a0, a1, a2))
+ %End

Property changes on: head/math/qtiplot/files/patch-sip-4.19.6
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+yes
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