Re-enable support for KNITRO@13 and KNITRO@14 (#369)

Author: odow

ext/KNITROMathOptInterfaceExt.jl

@@ -257,7 +257,9 @@ end
 
 # MOI.TimeLimitSec
 
-MOI.supports(model::Optimizer, ::MOI.TimeLimitSec) = true
+# We support `MOI.TimeLimitSec` only in newer versions of KNITRO because we
+# require `KN_PARAM_MAXTIME`.
+MOI.supports(::Optimizer, ::MOI.TimeLimitSec) = KNITRO.knitro_version() >= v"15"
 
 MOI.get(model::Optimizer, ::MOI.TimeLimitSec) = model.time_limit_sec
 
@@ -1006,7 +1008,9 @@ function MOI.supports_constraint(
     ::Type{MOI.VectorOfVariables},
     ::Type{MOI.Complements},
 )
-    return true
+    # We don't support complementarity constraints in older versions of KNITRO
+    # because we require `KN_add_compcons`.
+    return KNITRO.knitro_version() >= v"15"
 end
 
 function MOI.add_constraint(

src/KNITRO.jl

@@ -28,11 +28,11 @@ end
 @static if isdefined(@__MODULE__, :libknitro)
     # deps.jl must define a local installation.
     let version = has_knitro() ? knitro_version() : v"15.0.0"
-        if v"15" <= version < v"16"
+        if v"13" <= version < v"16"
             error(
                 "You have installed version $version of Artelys Knitro, " *
                 "which is not supported by KNITRO.jl. We require a version " *
-                "in [15, 16)",
+                "in [13, 16)",
             )
         end
     end