[Qgis-user] add a custom projection, Qgis 2.18.4

[Julien Guilloux]

Hi, 

i want to use an old French coordinate projection . 
this projection (called ATIG / Bonne France Etat Major) can be seen here : http://spatialreference.org/ref/sr-org/8192/ 

i clic on proj4.... 
so i can see and i can copy the Proj 4 définition as follow: 
+proj=bonne +lon_0=0 +lat_1=0 +x_0=0 +y_0=0 +a=6376523 +b=6355862.933255573 +towgs84=1127,22,57,0,0,0,0 +pm=2.337208333333333 +units=m +no_defs 
In Qgis, it is not possible to add this proj 4 ! An error appear when i add this custom projection : 
"proj 4 definition is not valid". 

any idea ? 

best regards ! 
Julien
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