only use BinaryProvider if building from source

Author: MikaelSlevinsky

deps/build.jl

@@ -1,21 +1,20 @@
-using BinaryProvider
-import Libdl
+if get(ENV, "FT_BUILD_FROM_SOURCE", "false") == "true"
+    using BinaryProvider
+    import Libdl
 
-const extension = Sys.isapple() ? "dylib" : Sys.islinux() ? "so" : Sys.iswindows() ? "dll" : ""
+    const extension = Sys.isapple() ? "dylib" : Sys.islinux() ? "so" : Sys.iswindows() ? "dll" : ""
 
-print_error() = error(
-    "FastTransforms could not be properly installed.\n Please check that you have all dependencies installed. " *
-    "Sample installation of dependencies:\n" *
-    print_platform_error(platform_key_abi())
-)
+    print_error() = error(
+        "FastTransforms could not be properly installed.\n Please check that you have all dependencies installed. " *
+        "Sample installation of dependencies:\n" *
+        print_platform_error(platform_key_abi())
+    )
 
-print_platform_error(p::Platform) = "On $(BinaryProvider.platform_name(p)), please consider opening a pull request to add support to build from source.\n"
-print_platform_error(p::MacOS) = "On MacOS\n\tbrew install libomp fftw mpfr\n"
-print_platform_error(p::Linux) = "On Linux\n\tsudo apt-get install libomp-dev libblas-dev libopenblas-base libfftw3-dev libmpfr-dev\n"
-print_platform_error(p::Windows) = "On Windows\n\tvcpkg install openblas:x64-windows fftw3[core,threads]:x64-windows mpir:x64-windows mpfr:x64-windows\n"
+    print_platform_error(p::Platform) = "On $(BinaryProvider.platform_name(p)), please consider opening a pull request to add support to build from source.\n"
+    print_platform_error(p::MacOS) = "On MacOS\n\tbrew install libomp fftw mpfr\n"
+    print_platform_error(p::Linux) = "On Linux\n\tsudo apt-get install libomp-dev libblas-dev libopenblas-base libfftw3-dev libmpfr-dev\n"
+    print_platform_error(p::Windows) = "On Windows\n\tvcpkg install openblas:x64-windows fftw3[core,threads]:x64-windows mpir:x64-windows mpfr:x64-windows\n"
 
-ft_build_from_source = get(ENV, "FT_BUILD_FROM_SOURCE", "false")
-if ft_build_from_source == "true"
     make = Sys.iswindows() ? "mingw32-make" : "make"
     flags = Sys.isapple() ? "FT_USE_APPLEBLAS=1" : Sys.iswindows() ? "FT_FFTW_WITH_COMBINED_THREADS=1" : ""
     script = """