gcc compiler
gcc - minimum macOS version
Specifying SDK version while compiling
gcc -o myTestApp myTestApp.c -mmacosx-version-min=10.9
info.plist
<key>LSMinimumSystemVersion</key>
<string>10.9.0</string>
Verifying which SDK was used for compiling a binary
otool -l /path/to/binary
then inspect the LC_VERSION_MIN_MACOSX load command; specifically, the version field.
cmd LC_VERSION_MIN_MACOSX
cmdsize 16
version 10.6 <-- Snow Leopard
sdk 10.13
Winteracter - minimum macOS version
The above is also valid for Winteracter since the Fortran compiler is written in C.
