move vendored libraries to their own directory

LICENSE.md

@@ -45,14 +45,18 @@ referenced by citing:
 [N. B. Marushchenko, C. D. Beidler, and H. Maassberg, *Fusion Sci.
 Technol.* **55** (2009) 180](https://doi.org/10.13182/FST55-180).
 
-GRAY includes adaptations of software developed by the University of
+GRAY contains adaptations of software developed by the University of
 Chicago, as Operator of Argonne National Laboratory, and other public
-domain libraries
-([`dierckx`](https://netlib.org/dierckx/),
-[`minpack`](https://netlib.org/minpack/),
-[`quadpack`](https://netlib.org/quadpack/),
-[`slatec`](https://netlib.org/slatec/))
-obtained from the [Netlib](https://netlib.org/) repository.
+domain libraries, including but not limited to, the following packages
 
-The full license notice for the `minpack` library can be found in the
-[documentation](./minpack-LICENSE.txt).
+  - [`dierckx`](https://netlib.org/dierckx/),
+
+  - [`minpack`](https://netlib.org/minpack/),
+
+  - [`quadpack`](https://netlib.org/quadpack/),
+
+  - [`slatec`](https://netlib.org/slatec/)
+
+that were obtained from the [Netlib](https://netlib.org/) repository.
+For more information refer to the relevant source code in the
+[src/vendor]{./src/vendor} directory.

Makefile

@@ -33,10 +33,10 @@ DIRS = $(BINDIR) $(OBJDIR) $(INCDIR) $(LIBDIR) $(SHAREDIR)
 ##
 
 # All Fortran source files
-SOURCES = $(wildcard $(SRCDIR)/*.f90)
+SOURCES = $(shell find '$(SRCDIR)' -name '*.f90')
 
 # All Fortran object
-OBJECTS = $(patsubst $(SRCDIR)/%.f90,$(OBJDIR)/%.o,$(SOURCES))
+OBJECTS = $(addprefix $(OBJDIR)/,$(notdir $(SOURCES:f90=o)))
 
 # Generated makefiles describing object dependencies
 DEPS = $(OBJECTS:o=d)
@@ -226,6 +226,10 @@ $(OBJDIR)/%.d: $(SRCDIR)/%.f90 | $(OBJDIR)
 $(OBJDIR)/%.o: $(SRCDIR)/%.f90 | $(OBJDIR) $(INCDIR)
 	$(FC) -cpp $(CPPFLAGS) $(FFLAGS) -c '$<' -o '$@'
 
+# Compile vendored libraries
+$(OBJDIR)/%.o: $(SRCDIR)/vendor/%.f90 | $(OBJDIR) $(INCDIR)
+	$(FC) -cpp $(CPPFLAGS) $(FFLAGS) -c '$<' -o '$@'
+
 # Generate Fortran code from awk script
 $(INCDIR)/%.inc: $(SRCDIR)/%.awk | $(INCDIR)
 	awk -f '$<' > '$@'