Add path independence

samples/libzstd/README

@@ -1,11 +1,13 @@
-* Install libffmpeg on Mac using homebrew
+* Install zstd on
 
-    brew install zstd
+    Mac: using homebrew "brew install zstd"
+    Linux: use the relevant package manager (e.g. "sudo apt install libzstd-dev"). The -dev variant includes the necessary headers.
 
 * run ./compile.sh or ./compilesource.sh to jextract zstd headers
 
 * run
 
     sh ./run.sh
 
-
+NOTE: For Linux, the path $(brew --prefix zstd) needs to be replaced with
+      relevant code (e.g. $(pkg-config --variable=prefix libzstd) )

samples/libzstd/compile.sh

@@ -1,6 +1,6 @@
 jextract -t libzstd \
-  -I /usr/local/Cellar/zstd/1.5.2/include \
+  -I "$(brew --prefix zstd)/include" \
   -l zstd \
   --header-class-name Libzstd \
-    /usr/local/Cellar/zstd/1.5.2/include/zstd.h
+  "$(brew --prefix zstd)/include/zstd.h"
 

samples/libzstd/compilesource.sh

@@ -1,7 +1,7 @@
 jextract --source -t libzstd \
-  -I /usr/local/Cellar/zstd/1.5.2/include \
+  -I "$(brew --prefix zstd)/include" \
   -l zstd \
   --header-class-name Libzstd \
-  /usr/local/Cellar/zstd/1.5.2/include/zstd.h
+  "$(brew --prefix zstd)/include/zstd.h"
 
 javac --enable-preview --source=20 libzstd/*.java

samples/libzstd/run.sh

@@ -1,3 +1,3 @@
 java --enable-native-access=ALL-UNNAMED \
    --enable-preview --source=20 \
-   -Djava.library.path=/usr/local/Cellar/zstd/1.5.2/lib LibzstdMain.java
+   -Djava.library.path="$(brew --prefix zstd)/lib" LibzstdMain.java