fix eigen incorrectly disabling unsupported (#5601)

packages/e/eigen/xmake.lua

@@ -1,5 +1,4 @@
 package("eigen")
-    set_kind("library", {headeronly = true})
     set_homepage("https://eigen.tuxfamily.org/")
     set_description("C++ template library for linear algebra")
     set_license("MPL-2.0")
@@ -11,6 +10,9 @@ package("eigen")
     add_versions("3.3.8", "0215c6593c4ee9f1f7f28238c4e8995584ebf3b556e9dbf933d84feb98d5b9ef")
     add_versions("3.3.9", "0fa5cafe78f66d2b501b43016858070d52ba47bd9b1016b0165a7b8e04675677")
     add_versions("3.4.0", "b4c198460eba6f28d34894e3a5710998818515104d6e74e5cc331ce31e46e626")
+
+    add_configs("blas", {description = "Provide a Eigen-implemented BLAS.", default = false, type = "boolean"})
+    add_configs("lapack", {description = "Provide a Eigen-implemented LAPACK.", default = false, type = "boolean"})
     
     if is_plat("mingw") and is_subhost("msys") then
         add_extsources("pacman::eigen3")
@@ -23,9 +25,19 @@ package("eigen")
     add_deps("cmake")
     add_includedirs("include")
     add_includedirs("include/eigen3")
+    on_load(function (package)
+        if not package:config("blas") and not package:config("lapack") then
+            package:set("kind", "library", {headeronly = true})
+        end
+    end)
 
     on_install(function (package)
-        io.replace("CMakeLists.txt", "add_subdirectory", "#", {plain = true})
+        if not package:config("blas") then
+            io.replace("CMakeLists.txt", "add_subdirectory(blas", "#", {plain = true})
+        end
+        if not package:config("lapack") then
+            io.replace("CMakeLists.txt", "add_subdirectory(lapack", "#", {plain = true})
+        end
         import("package.tools.cmake").install(package, {"-DBUILD_TESTING=OFF"})
 
         if not os.isfile(package:installdir("include/eigen3/Eigen/Dense")) then