V1.Pkg_configval query : t -> package:string -> package_conf optionquery t ~package query pkg-config for the package. The package may contain a version constraint. For example "gtk+-3.0 >= 3.18". Returns None if package is not available
val query_expr : t -> package:string -> expr:string -> package_conf optionval query_expr_err :
t ->
package:string ->
expr:string ->
(package_conf, string) Dune_result.Result.tquery_expr_err t ~package ~expr query pkg-config for the package. expr may contain a version constraint, for example "gtk+-3.0 >= 3.18". package should be just the name of the package. Returns Error error_msg if package is not available