diff --git a/_cmptest/cfgdata/bzip2/darwin/1.0.8/llcppg.cfg b/_cmptest/cfgdata/bzip2/darwin/1.0.8/llcppg.cfg
index 7bd359a1..b7beebd8 100644
--- a/_cmptest/cfgdata/bzip2/darwin/1.0.8/llcppg.cfg
+++ b/_cmptest/cfgdata/bzip2/darwin/1.0.8/llcppg.cfg
@@ -4,11 +4,5 @@
 	"libs": "$(pkg-config --libs bzip2)",
 	"include": [
 		"bzlib.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/bzip2/linux/1.0.8/llcppg.cfg b/_cmptest/cfgdata/bzip2/linux/1.0.8/llcppg.cfg
index 7bd359a1..b7beebd8 100644
--- a/_cmptest/cfgdata/bzip2/linux/1.0.8/llcppg.cfg
+++ b/_cmptest/cfgdata/bzip2/linux/1.0.8/llcppg.cfg
@@ -4,11 +4,5 @@
 	"libs": "$(pkg-config --libs bzip2)",
 	"include": [
 		"bzlib.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/bzip3/darwin/1.5.1/llcppg.cfg b/_cmptest/cfgdata/bzip3/darwin/1.5.1/llcppg.cfg
index 3574f1b2..dfda6239 100644
--- a/_cmptest/cfgdata/bzip3/darwin/1.5.1/llcppg.cfg
+++ b/_cmptest/cfgdata/bzip3/darwin/1.5.1/llcppg.cfg
@@ -4,11 +4,5 @@
 	"libs": "$(pkg-config --libs bzip3)",
 	"include": [
 		"libbz3.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/bzip3/linux/1.5.1/llcppg.cfg b/_cmptest/cfgdata/bzip3/linux/1.5.1/llcppg.cfg
index 3574f1b2..dfda6239 100644
--- a/_cmptest/cfgdata/bzip3/linux/1.5.1/llcppg.cfg
+++ b/_cmptest/cfgdata/bzip3/linux/1.5.1/llcppg.cfg
@@ -4,11 +4,5 @@
 	"libs": "$(pkg-config --libs bzip3)",
 	"include": [
 		"libbz3.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/cargs/darwin/1.2.0/llcppg.cfg b/_cmptest/cfgdata/cargs/darwin/1.2.0/llcppg.cfg
index 21b30c1e..a7934407 100644
--- a/_cmptest/cfgdata/cargs/darwin/1.2.0/llcppg.cfg
+++ b/_cmptest/cfgdata/cargs/darwin/1.2.0/llcppg.cfg
@@ -4,11 +4,5 @@
 	"libs": "$(pkg-config --libs cargs)",
 	"include": [
 		"cargs.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/cargs/linux/1.2.0/llcppg.cfg b/_cmptest/cfgdata/cargs/linux/1.2.0/llcppg.cfg
index 21b30c1e..a7934407 100644
--- a/_cmptest/cfgdata/cargs/linux/1.2.0/llcppg.cfg
+++ b/_cmptest/cfgdata/cargs/linux/1.2.0/llcppg.cfg
@@ -4,11 +4,5 @@
 	"libs": "$(pkg-config --libs cargs)",
 	"include": [
 		"cargs.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/cjson/darwin/1.7.17/llcppg.cfg b/_cmptest/cfgdata/cjson/darwin/1.7.17/llcppg.cfg
index 228819b8..b8ea02ee 100644
--- a/_cmptest/cfgdata/cjson/darwin/1.7.17/llcppg.cfg
+++ b/_cmptest/cfgdata/cjson/darwin/1.7.17/llcppg.cfg
@@ -5,11 +5,5 @@
 	"include": [
 		"cjson/cJSON_Utils.h",
 		"cjson/cJSON.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/cjson/darwin/1.7.18/llcppg.cfg b/_cmptest/cfgdata/cjson/darwin/1.7.18/llcppg.cfg
index 228819b8..b8ea02ee 100644
--- a/_cmptest/cfgdata/cjson/darwin/1.7.18/llcppg.cfg
+++ b/_cmptest/cfgdata/cjson/darwin/1.7.18/llcppg.cfg
@@ -5,11 +5,5 @@
 	"include": [
 		"cjson/cJSON_Utils.h",
 		"cjson/cJSON.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/cjson/linux/1.7.17/llcppg.cfg b/_cmptest/cfgdata/cjson/linux/1.7.17/llcppg.cfg
index 228819b8..b8ea02ee 100644
--- a/_cmptest/cfgdata/cjson/linux/1.7.17/llcppg.cfg
+++ b/_cmptest/cfgdata/cjson/linux/1.7.17/llcppg.cfg
@@ -5,11 +5,5 @@
 	"include": [
 		"cjson/cJSON_Utils.h",
 		"cjson/cJSON.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/cjson/linux/1.7.18/llcppg.cfg b/_cmptest/cfgdata/cjson/linux/1.7.18/llcppg.cfg
index 228819b8..b8ea02ee 100644
--- a/_cmptest/cfgdata/cjson/linux/1.7.18/llcppg.cfg
+++ b/_cmptest/cfgdata/cjson/linux/1.7.18/llcppg.cfg
@@ -5,11 +5,5 @@
 	"include": [
 		"cjson/cJSON_Utils.h",
 		"cjson/cJSON.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/libtool/darwin/2.4.7/llcppg.cfg b/_cmptest/cfgdata/libtool/darwin/2.4.7/llcppg.cfg
index 97c754ae..0fd782c7 100644
--- a/_cmptest/cfgdata/libtool/darwin/2.4.7/llcppg.cfg
+++ b/_cmptest/cfgdata/libtool/darwin/2.4.7/llcppg.cfg
@@ -7,11 +7,5 @@
 		"libltdl/lt_dlloader.h",
 		"libltdl/lt_error.h",
 		"libltdl/lt_system.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/libtool/linux/2.4.7/llcppg.cfg b/_cmptest/cfgdata/libtool/linux/2.4.7/llcppg.cfg
index 97c754ae..0fd782c7 100644
--- a/_cmptest/cfgdata/libtool/linux/2.4.7/llcppg.cfg
+++ b/_cmptest/cfgdata/libtool/linux/2.4.7/llcppg.cfg
@@ -7,11 +7,5 @@
 		"libltdl/lt_dlloader.h",
 		"libltdl/lt_error.h",
 		"libltdl/lt_system.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/libxml2/darwin/2.13.6/llcppg.cfg b/_cmptest/cfgdata/libxml2/darwin/2.13.6/llcppg.cfg
index a0379aaa..3edf2378 100644
--- a/_cmptest/cfgdata/libxml2/darwin/2.13.6/llcppg.cfg
+++ b/_cmptest/cfgdata/libxml2/darwin/2.13.6/llcppg.cfg
@@ -52,11 +52,5 @@
 		"libxml2/win32config.h",
 		"zlib.h",
 		"zconf.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/libxml2/linux/2.13.6/llcppg.cfg b/_cmptest/cfgdata/libxml2/linux/2.13.6/llcppg.cfg
index a0379aaa..3edf2378 100644
--- a/_cmptest/cfgdata/libxml2/linux/2.13.6/llcppg.cfg
+++ b/_cmptest/cfgdata/libxml2/linux/2.13.6/llcppg.cfg
@@ -52,11 +52,5 @@
 		"libxml2/win32config.h",
 		"zlib.h",
 		"zconf.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/sqlite3/darwin/3.49.1/llcppg.cfg b/_cmptest/cfgdata/sqlite3/darwin/3.49.1/llcppg.cfg
index 85adc78e..840ace64 100644
--- a/_cmptest/cfgdata/sqlite3/darwin/3.49.1/llcppg.cfg
+++ b/_cmptest/cfgdata/sqlite3/darwin/3.49.1/llcppg.cfg
@@ -5,11 +5,5 @@
 	"include": [
 		"sqlite3ext.h",
 		"sqlite3.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/sqlite3/linux/3.49.1/llcppg.cfg b/_cmptest/cfgdata/sqlite3/linux/3.49.1/llcppg.cfg
index 85adc78e..840ace64 100644
--- a/_cmptest/cfgdata/sqlite3/linux/3.49.1/llcppg.cfg
+++ b/_cmptest/cfgdata/sqlite3/linux/3.49.1/llcppg.cfg
@@ -5,11 +5,5 @@
 	"include": [
 		"sqlite3ext.h",
 		"sqlite3.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/zlib/darwin/1.3.1/llcppg.cfg b/_cmptest/cfgdata/zlib/darwin/1.3.1/llcppg.cfg
index 8038796b..0f91d5a8 100644
--- a/_cmptest/cfgdata/zlib/darwin/1.3.1/llcppg.cfg
+++ b/_cmptest/cfgdata/zlib/darwin/1.3.1/llcppg.cfg
@@ -5,11 +5,5 @@
 	"include": [
 		"zlib.h",
 		"zconf.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/_cmptest/cfgdata/zlib/linux/1.3.1/llcppg.cfg b/_cmptest/cfgdata/zlib/linux/1.3.1/llcppg.cfg
index 8038796b..0f91d5a8 100644
--- a/_cmptest/cfgdata/zlib/linux/1.3.1/llcppg.cfg
+++ b/_cmptest/cfgdata/zlib/linux/1.3.1/llcppg.cfg
@@ -5,11 +5,5 @@
 	"include": [
 		"zlib.h",
 		"zconf.h"
-	],
-	"trimPrefixes": null,
-	"cplusplus": false,
-	"deps": [],
-	"keepUnderScore": false,
-	"impl": null,
-	"mix": false
+	]
 }
diff --git a/config/config.go b/config/config.go
index e9935d8d..44916a89 100644
--- a/config/config.go
+++ b/config/config.go
@@ -25,12 +25,12 @@ type Config struct {
 	CFlags         string            `json:"cflags"`
 	Libs           string            `json:"libs"`
 	Include        []string          `json:"include"`
-	TrimPrefixes   []string          `json:"trimPrefixes"`
-	Cplusplus      bool              `json:"cplusplus"`
-	Deps           []string          `json:"deps"`
-	KeepUnderScore bool              `json:"keepUnderScore"`
-	Impl           []ImplFiles       `json:"impl"`
-	Mix            bool              `json:"mix"`
+	TrimPrefixes   []string          `json:"trimPrefixes,omitempty"`
+	Cplusplus      bool              `json:"cplusplus,omitempty"`
+	Deps           []string          `json:"deps,omitempty"`
+	KeepUnderScore bool              `json:"keepUnderScore,omitempty"`
+	Impl           []ImplFiles       `json:"impl,omitempty"`
+	Mix            bool              `json:"mix,omitempty"`
 	SymMap         map[string]string `json:"symMap,omitempty"`
 	TypeMap        map[string]string `json:"typeMap,omitempty"`
 }